Perhaps you should try some spelling variations:
davis test » davis best, davis tsu
david west » david webster
yan yang » yang yang, yao yang, dan yang
kim dong » kim jong, kim young, kim eung
kim song » kim young, kim eung
wan yan » wang yan, nan yan, wai yan
yong » young, long, hong

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

• Performing a fuzzy search may retrieve terms with similar spellings: wan yan yang ((davis test) OR (david west)) yong ((kim dong) or (kim song)) (sin or wing) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wan yan yang ((davis test) OR (david west)) yong ((kim dong) OR (kim song)) (sin OR wing) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yan yang ((davis test) OR (david west)) yong ((kim dong) or (kim song)) (sin or wing) ;*".