Perhaps you should try some spelling variations:
china hall » china fall, china hello, china small
than china » tuan china, han china, wuhan china
duong van » duong anh
yang july » yang judy, yang jui, yang jun
cong van » congo can, cong sun
yang yi » yang xi, yang jui
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: ((cong van) OR (duong van)) than china hall ((((yang di) OR (yang yi))) OR (yang july)) wang hua ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cong van) OR (duong van)) than china hall ((((yang di) or (yang yi))) or (yang july)) wang hua ;~".
• Adding a wildcard symbol may retrieve word variants: ((cong van) OR (duong van)) than china hall ((((yang di) or (yang yi))) or (yang july)) wang hua ;*.