Let me assume that you are interested in Vietnam in regards to business opportunities.
In that case a visit to the Vietnam consulate would open a flood gate of help by them. (i.e.) Consulate General of Vietnam in San Francisco http://www.vietnamconsulate-ca.org/home.asp
But if its an adventure you seek, and to travel widely, then you can book ahead into these many bed and breakfast locations that will be populated by many other foreign travelers, most all will speak English. http://www.hoteltravelvietnam.com/Vietnam+Travel+News/Vietnam+Travel+News/foreignarrivalstovietnamhit2.5million/ In August, foreign visitors to Vietnam numbered 310,000, an 8-percent increase over last year's August. The number of foreign visitors from Asia, Europe and the US surged between 11-50 percent with visitors from Thailand increasing by 50 percent; the Republic of Korea, 32 percent; Malaysia, 27 percent; Denmark, 26 percent; Japan and Russia, each up 23 percent.
You will be fine in that great country. Stick to the larger cities, find you a guide, and they will stick with you for VERY little pay. There are Tons of beautiful scenes especially the women there are GREAT.