Perhaps you should try some spelling variations:
china zhang » china chang, cheng zhang, chin chang
zhang wang » zhang fang, zhang zhang, zhang fan
kyoung yun » young yun, kyoung yang, hyoung gun
zheng yan » zheng alan, zheng quan, zheng xuan
zhang yan » zhang fan, zhang jian, wang yan
hyoung yu » hyoung gun, hong yu, young kyu
je china » je chin, ke china, use china

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 ((zheng yan) OR (zhang yan)) je china zhang wang ((hyoung yu) OR (kyoung yun)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((zheng yan) or (zhang yan)) je china zhang wang ((hyoung yu) or (kyoung yun)) ;*.