Xem quy chế tại đây
If you still can't find an answer to what you're looking for, or you have a specific question, open a new ticket and we'd be happy to help!
Some of our site pages utilize cookies and other tracking technologies. A cookie is a small text file that may be used, for example, to collect information about site activity. Some cookies and other technologies may serve to recall personal information previously indicated by a site user. You may block cookies, or delete existing cookies, by adjusting the appropriate setting on your browser. Please consult the HELP menu of your browser to learn how to do this. If you block or delete cookies you may find the usefulness of our site to be impaired.