Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
china zhang » china chang, chin chang, china han
lang sheng » fang sheng, bing sheng, dong sheng
hyoung gun » young eun
yang jie » yang di, yang jui, yang xi
yang jin » yang jun, ying jin, shang jin

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