Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song min
yuan li » yuan lin, guan li, yuan zi
yang li » yang lin, yang di, yang xi
li sang » le sang, li gang, li san
hong du » hong yu, hong tou
long du » long d, long do, long run
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ((yuan li) OR (yang li)) li sang minh ((hong du) OR (long du)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((yuan li) or (yang li)) li sang minh ((hong du) OR (long du)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan ((yuan li) or (yang li)) li sang minh ((hong du) OR (long du)) ;*.