Perhaps you should try some spelling variations:
yong yoon » wong yoon, yong khoon
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
chang hai » chang ha, shang hai, change has
yuan kai » yuan kang, yuan fei, tan kai
kai yang » kai fang, yao yang, dan yang
xi chang » ii chang, xi cheng, xi zhang
yang xi » yang di, yang yi, 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: wang ((yong yoon) OR (((dong yang) OR (yang yang)))) yuan kai yang xi chang hai ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yong yoon) or (((dong yang) or (yang yang)))) yuan kai yang xi chang hai ;*.