This is posted a few days ago by
@Tod ********
original rose bordered marriage certificate (if married in thailand)
Copies of;
-frt&bk of the rose bordered marriage certificate
-frt&bk of your thai wife's i/d card
-thai wife's house book listing
-data page of your passport
-visa/entry stamp to Vietnam
You sign everything with your name on it and she signs everything with hers meaning you BOTH sign the marriage certificate copies
Those things the hand written letter from your wife asking the consulate to issue the visa along with a filled out application (that you can get there or download) AND 200US dollars gets you the visa.
Turn in your application one morning, pick up your passport the next afternoon.