Question: As an USA businessman, I need to travel a lot. I have to go to Vietnam very frequently on business. Is there any facility for frequent business travelers like me?

Answer: You can apply for a 1-year or 3-year multiple-entry business visa which would allow you to travel to Vietnam as frequently as you want while the visa remains valid.

You can find more information on the basic requirements for this kind of visa http://www.vnimm.gov.vn/%5CIndexe.asp . If you just stay in Vietnam in short time each your trip, you should apply for 3 moths multiple visa then as your visa is going to expire, you can extend your visa if you still live in Vietnam or apply for a new visa if you exit the country.