Perhaps you should try some spelling variations:
yan hoang » tran hoang, tan hong, anh hoang
hoang hai » hong hai, dang hai, hoang h
yang jin » yang jie, yang jun, ying jin
wong sau » wong sam, wong siu, wong shiu
yan jiu » yang jie, pang jiu
yang xi » yang di, yang yi, 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: wang yan hoang hai (rest OR west) ((((yan jiu) OR (yang xi))) OR (yang jin)) wong sau ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan hoang hai (rest or west) ((((yan jiu) or (yang xi))) or (yang jin)) wong sau ;*.