I'm doing some research for a project at school and ran into this tidbit. Thought I'd share:
Wikipedia has a nice post on Vietnamese surnames, but they're not all in order. I added the tones so they might be off. Let me know if I muffed your last name! I'll fix it.
This list is used by the US Department of Justice and is based on several sources:
Abrahamse A. F., Morrison, P. A. & Bolton, N. M. (1994). Population Research and Policy Review: 13 383-398.
Barringer, H. R., Gardner, R. W. & Levin, M.J. (1993). Asians and Pacific Islanders in the United States. The Population of the United States in the 1980s.
Buechley, R. W. (1976). Generally useful ethnic search system: GUESS. University of New Mexico, Cancer Research and Treatment Cetner (mimeo).
Choi, B. C. K., Hanley, A. J., Holowaty, E. J. & Dale, D. (1993). American Journal of Epidemiology 138: 723-734
Kuo, J. & Porter, K. (1998). Health status of Asian Americans: United States, 1992-1994.