Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
chen yang » chen rong
yang john » young john, king john, yang jin
john kong » john king, john song, john wong
yan yang » yao yang, dan yang, tan yang
yu chen » yu cheng, yi chen, yulu chen
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yan yang) OR (yang yang)) yu chen yang john kong (sar or star) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan yang) OR (yang yang)) yu chen yang john kong (sar OR star) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan yang) OR (yang yang)) yu chen yang john kong (sar or star) ;".
• Adding a wildcard symbol may retrieve word variants: wang ((yan yang) OR (yang yang)) yu chen yang john kong (sar or star) ;*.