Chăm luyện

Last updated 5 November 2026.

In short

Chăm luyện is a practice app for pupils in grades 1 to 9, learning with a grown-up at home. By using the app, signing in or sending anything to our server (a name, a drawing, scores, reports, ideas), you agree to these terms. For a child, the adult who creates the account agrees on the child's behalf and helps the child understand what follows. How we handle data is in the privacy policy.

Accounts

Accounts are created and managed by adults and sign in with a phone number and a password. Keep the password within the family; one account works on at most two devices. An adult can delete the account at any time in Settings > Tài khoản, or on the delete account page.

On iPhone, iPad and Mac, plans bought in the app are charged by Apple under Apple's terms; refunds are handled by Apple. On the App Store, Apple's standard End User License Agreement also applies.

What others see

When an account is on the national board or plays Đấu 1-1, other users see the name entered in the app, the last four digits of the phone number, scores, and the buddy picture (a built-in one, or a drawing if an adult chose it; photos are never sent). There is no chat and no free text between users. In Đấu 1-1, when no pupil of the same grade is waiting, and always outside 06:00 to 21:30 Vietnam time, the opponent is a computer player run by the server, with a sample name and picture.

Not allowed

Names, drawings, game ideas, reports and anything else sent to the app must not contain:

• rude words, insults, mockery or bullying;
• sexual, violent or frightening content, or hate;
• personal information: full names, schools, addresses, phone numbers or social media accounts, your own or anyone else's;
• advertising, links, invitations to get in touch outside the app, or scams;
• impersonation, or someone else's work used without permission.

Cheating on scores (modified apps, automated tools, deliberately abandoning matches), disrupting or attacking the server, and using someone else's account are not allowed either.

Reporting, blocking and moderation

The server filters names (a rude or phone-like name shows as "Bạn nhỏ") and scans drawings before others see them. If something is wrong:

• Board: tap the flag next to the row to report it (after a question for grown-ups), or just hide the row on this device.
• Đấu 1-1: on the result screen, the "⋯" menu has "Báo cáo bạn này" (report) and "Chặn bạn này" (block). A blocked player is never matched with you again; see and unblock in Settings > Đấu 1-1.
• Any time: write to support@khangazun.com or use the support page.

We look at every report promptly, usually within 24 hours. Depending on what happened, we may change a name to "Bạn nhỏ", block a picture, remove scores, turn off Đấu 1-1 for an account or lock it.

Playing safely with others

The players on the board and in Đấu 1-1 are people the child does not know. Please remind the child: pick a short nickname, never a full name or a school; never give anyone a phone number, an address or a photo; and tell a grown-up straight away about anything that feels wrong.

The app's content

The questions, lines, voices, pictures and games in Chăm luyện are written and made by us, following Vietnam's 2018 general education curriculum. Chăm luyện is not affiliated with or endorsed by the Ministry of Education and Training or any textbook publisher. We check every question but mistakes can slip through; please use "Báo lỗi câu hỏi" to tell us. The app is for practice and does not replace teachers or textbooks.

A child's own drawing stays the child's. When an adult chooses to show it on the board, you let us keep a small copy and show it to other users in the app until you change the picture or delete the account.

Changes and ending

We may add, change or stop a feature and update these terms; the date at the top shows the last update, and important changes are announced in the app or in an update's release notes. The app is provided as is; we work to keep the server running but cannot promise it is never interrupted. These terms are governed by the laws of Vietnam.

Contact

Questions about these terms, or anything else: support@khangazun.com.