looking for you daughter

My father was a veteran of the vietnam war and recently passed away this summer. During a visit with his family I discovered that he was actually engaged to woman while in vietnam. Apparently he was unable to bring her back to the states so it didn't work out. His family seems to believe that there may have been a child involved but we aren't for sure. If that is the case I would love to find them. If you find a website that you can locate this information please send it to me at shawnorr@hotmail.com. Good Luck in your search and Thank you...