Mail.google.com vn moi

You're trying to access Gmail in Vietnamese!

Here's the correct URL:

mail.google.com/vi

The vi part is the language code for Vietnamese. You can also use mail.google.com/vn as an alternative, but vi is the more commonly used and recommended code.

Once you access the URL, you'll be able to use Gmail in Vietnamese, with the interface and menus translated to Vietnamese.