Hi BangNguyen93,
I'm Rodrigo and I will help you.
To remove this entry, on the start Menu type regedit and press enter. On the Registry Editor, go to the following keys and delete the values that have the Vietnamese layout code - 0000042a: (you can copy and paste the path on the address bar)
HKEY_USERS.DEFAULT\Keyboard Layout\Substitutes
HKEY_CURRENT_USER\Keyboard Layout\Substitutes
After deleting it, restart the computer to apply the changes.