Perhaps you should try some spelling variations:
china zhang » china chang, cheng zhang, chin chang
zhang zhang » zhen zhang, cheng zhang, zhang fang
wang sheng » fang sheng, wang zheng, wang susheng
hyoung yu » hyoung gun, kyoung yun, young kyu
yang jin » yang jie, yang jun, ying jin
hong yu » wong yue
yan je » han je, yang jie

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 sheng ((yan je) OR (yang jin)) china zhang zhang ((hyoung yu) OR (hong yu)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang sheng ((yan je) or (yang jin)) china zhang zhang ((hyoung yu) OR (hong yu)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang sheng ((yan je) or (yang jin)) china zhang zhang ((hyoung yu) OR (hong yu)) ;*.