Perhaps you should try some spelling variations:
van china » can china, dan china, han china
china als » china aus, china aids, china a
yang july » yang judy, yang jui, yang jun
cong van » congo can, duong van, cong sun
lang hua » wang hua, wang hui, dong hua
tong hui » wang hui
yang yi » yang xi, yang jui

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: cong van china china als ((((yang yi) OR (yang di))) OR (yang july)) ((lang hua) OR (tong hui)) ;~.
• Adding a wildcard symbol may retrieve word variants: cong van china china als ((((yang yi) or (yang di))) or (yang july)) ((lang hua) or (tong hui)) ;*.