Perhaps you should try some spelling variations:
china zhang » china chang, chin chang, china han
cheng zhang » cheng han, zhen zhang, chen zheng
yun kyoung » hyun kyoung, yun young, yi kyoung
kyoung yun » young yun, kyoung yang, hyoung gun
yang hui » yang jui, wang hui, yang muxi
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.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan ((yang xi) or (yang hui)) ((china zhang) OR (cheng zhang)) yun kyoung yun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan ((yang xi) OR (yang hui)) ((china zhang) OR (cheng zhang)) yun kyoung yun ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan ((yang xi) or (yang hui)) ((china zhang) OR (cheng zhang)) yun kyoung yun ;*".