Perhaps you should try some spelling variations:
tuan china » wuhan china, can china, taiwan china
duong van » cong van, duong anh
china als » china aus, china aids, china a
yang july » yang judy, yang jun
van tuan » van thanh, anh tuan, vu tuan
yang jui » yang judy, yang xi, yang yi
wang » 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: duong van tuan china als ((((yang jui) OR (yang di))) OR (yang july)) (wang OR wing) hua ;~.
• Adding a wildcard symbol may retrieve word variants: duong van tuan china als ((((yang jui) or (yang di))) or (yang july)) (wang or wing) hua ;*.