Hi, you will need a 5 year visa application form to fill out. The form you need can be obtained at the Vietnamese embassy in the United States. In addition, the 5-year visa dog fee is 155 USD
Unless you are married to a Vietnamese citizen it will cost more than $70. You need to show a marriage certificate from Vietnam. My recommendation is to go to the consulate in San Francisco. And fill out the Visa form there. You don't need a picture since they will just take the picture from your passport. I know this because I did the process in May. And I don't know how much it cost if you are not married to a Vietnamese
on their website
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