Terms of Use

1. Service provider and scope

The service is provided by CONG TY TU VUNG FLOW (“we” or “us”). Address: 23 Nguyen Trai Street, Ben Thanh Ward, District 1, Ho Chi Minh City; telephone: +84 908 555 583. Support: founder@tuvungflow.id.vn.

“You” means a visitor or user. “Your content” includes vocabulary, notes, submissions, transcripts and information you enter. These terms cover our website and features; independent third-party services have their own terms. Unpublished provider information should not be treated as verified or legally registered information.

2. Acceptance and age requirements

Registration requires confirmation that you have read and accepted the current terms and that you are at least 16 or have your representative’s consent. Minors need consent, guidance or representation where required by law, particularly for account creation and purchases. Do not misrepresent your eligibility.

If you do not agree, do not create an account or purchase a plan. Acceptance of these terms does not replace separate consent to send content to AI Coach or join the activity board. Our Privacy Policy explains data processing and your rights.

3. Learning services and their limits

Từ Vựng Flow offers vocabulary, review, grammar, listening, pronunciation and TOEIC/IELTS practice tools. Features depend on your device, browser, plan and current configuration. Review the published benefits before purchasing.

Exercises and feedback support learning; they are not official exam questions, certificates or promises of a score, band, exam pass or career outcome. Results depend on your learning and other factors. AI features have usage limits and depend on activation and provider availability.

Some downloaded content may reopen without a connection. Login, sync, payments, AI and external resources require internet access; we do not guarantee that every feature works offline.

4. Registration, account management and security

Provide a valid email, complete verification when requested, and protect your password, devices, recovery links and authentication codes. Google login is available only when configured. An existing account is not automatically linked merely because it uses the same email.

Do not share, rent, sell or transfer a paid account without permission. If you suspect unauthorized access, change your password, revoke other sessions and contact support. We consider the cause and each party’s obligations when investigating; account use does not automatically make you liable for all harm outside your control.

The Account panel provides password changes, data export and account deletion. If a Google account has no password to confirm an action, use the email password-reset process or contact support. Never send support your password or one-time codes.

5. Local storage, backups and sync

Local learning progress and preferences are stored in the browser on your device. Clearing website data, private browsing, or switching browsers or devices can lose that data. Export a backup before doing so.

Sync requires login, acceptance of the current terms and the displayed plan conditions. Sync can change the local or server copy; read data selection and restoration notices. Sync does not replace a separate backup you keep.

Pro expiry does not automatically request account deletion. Deletion ends account access and associated plan rights; it does not automatically erase downloaded backups or all browser data. See retention and deletion in the Privacy Policy.

6. AI Coach and consent for each submission

AI Coach is an optional learning feedback feature. For each request, you select a Writing submission or Speaking transcript, read the data submission notice and select Send. The selected content, skill and feedback target are sent to the AI provider. Integrated with the Claude API. The request does not include your email, password or complete learning profile.

Submit only content you have permission to process. Do not include financial or health information, identity documents, passwords, business secrets or other people’s information. Other independent learning tools remain available without sending AI requests.

AI feedback can be wrong, incomplete or unsuitable for the context. Check suggestions yourself; they are not official scoring, TOEIC/IELTS score or band conversions, or certificates. Provider and retention details appear in the AI Coach section of the Privacy Policy.

7. Optional community activity board

You choose to join, select a display name and record learning days. Only your display name and total active days for the week are public. This is not a score ranking or verification of ability.

Do not impersonate, harass, advertise unlawfully or disclose personal data through a name. Choose a name without email or identifying information. You can leave at any time to remove your community profile and check-ins while keeping private learning progress. Viewers may have saved or captured previously public information.

8. Prices, benefits, payments and plan duration

Prices, currency, duration and benefits are displayed in Plans before payment. Check the account, plan and order amount. The current Pro plan lasts 365 days and does not renew automatically; continuation requires a purchase under the information then displayed.

Website payments are processed through payOS and the relevant banks. Plan access is granted after the server receives valid payment confirmation and checks the signature and order amount. A success-page redirect or transfer screenshot does not replace system confirmation.

If payment succeeds but access is missing, check order history and send the order code to support; avoid paying again. Provide accurate invoice details if you request an invoice. Receipts and invoices are issued according to the transaction and applicable requirements.

New transaction prices do not change amounts already paid for confirmed orders. If a change significantly affects an active plan’s benefits, we notify users and address their rights under the agreement and applicable law.

9. Cancellation and refund requests

You may stop a transaction before completing payment without a service fee. After payment, the Refund Policy sets out eligibility, the request process, processing times and effects on Pro access.

The current policy allows a request within 7 days if Pro features have not been used substantially, as well as cases involving duplicate or incorrect charges, missing access or serious service faults not resolved within a reasonable time. Other requests are reviewed individually without excluding mandatory consumer rights.

Deleting an account, logging out or stopping use does not automatically request a refund. Keep your order code and contact support; do not send card numbers, passwords or one-time codes. This policy covers website transactions, not Google Play or Apple App Store purchases.

10. Acceptable and prohibited use

You may use features within your granted access, lawful learning purposes and relevant content licenses. You must not:

• Access others’ data, conduct unauthorized scans, steal login sessions or impersonate others.
• Spread malware, disrupt service, evade limits or payment controls, or exploit faults to obtain access.
• Copy content in bulk, resell or redistribute it, or share plan access without permission.
• Submit unlawful or infringing content, violate privacy, or use the activity board for harassment or impersonation.
• Bypass AI safety controls or submit content you have no right to share.

Report security issues privately to support with only necessary evidence. Do not continue accessing data or causing harm.

11. Intellectual property and your content

Designs, software, our original content and branding belong to their respective owners. Third-party resources are linked or used under relevant licenses and attribution. Access to learning tools does not transfer ownership or grant commercial rights to these assets.

You retain rights to your content. By entering, syncing or sending it, you authorize us to process, store, transmit and display it only as needed for the requested feature. This does not authorize public disclosure of private submissions or their use in advertising without separate consent.

You must ensure your content does not infringe others’ rights. Permission ends when content is deleted or the relevant service ends, except for lawful retention, backup cycles and processing already completed. Copyright reports should identify the content location and include evidence of ownership.

12. Video, speech recognition and third-party services

The website may embed YouTube videos, link external learning resources, or use Google login, payment, email and AI providers. Those providers’ terms and data policies also apply when their services are loaded or used.

Microphone permission is requested only when you initiate pronunciation practice. Speech recognition depends on your browser and may use its provider’s services. Videos, captions and external resources may change, be restricted or become unavailable; we do not fully control them.

13. Suspension, termination and account deletion

We may limit or suspend access for suspected unauthorized access, fraud, security risks or serious violations. Urgent action to prevent harm may precede notice. We explain the reason where permitted and accept explanations and complaints through support.

You can stop using the service or request account deletion. Export your data and keep needed transaction information first. Paid amounts are handled under the Refund Policy and law; temporary suspension does not automatically remove every right.

Outstanding payment, intellectual property, lawful retention and dispute-resolution obligations continue after termination to the extent necessary.

14. Availability and liability

We work to maintain service, protect data and fix problems, but maintenance, connection issues and provider failures can occur. We do not guarantee uninterrupted, error-free service or that every learning resource or AI response is correct.

Review feedback, keep copies of important data and protect your login details. Contact support about faults affecting payment or plan access for investigation, correction or refund consideration.

Responsibility depends on the cause, lawful agreements and applicable law. No term excludes liability that cannot lawfully be excluded, restricts complaint or court rights, or removes mandatory consumer protections.

15. Changes and notices

We may update these terms for changes in features, operations or law. This page shows the document’s effective date and version. Significant changes to rights or data processing are communicated through the website, account or appropriate email notices.

The system may require explicit acceptance of new terms before sync or payment. Continued browsing does not replace separate consent where required by law or a feature. Changes do not retroactively remove lawfully accrued rights.

16. Contact, complaints and governing law

Send questions or complaints to founder@tuvungflow.id.vn with your account email, order code if relevant, a description and necessary evidence. We receive, verify and handle requests within applicable legal timeframes. Refund requests have separate estimated times in the Refund Policy.

These terms are interpreted and applied under Vietnamese law, including consumer and personal data protection requirements. We prioritize discussion and settlement, while you retain the right to approach consumer protection authorities or a competent court. If a provision is invalid, the remaining provisions continue to apply to the extent lawful.