Perhaps you should try some spelling variations:
hyoung kong » hong kong
zhang ping » zhang ming, zhang jing, zhang ting
der kein » der klein, der kern, der kleine
der keim » den keim, der kern, der kamm
wong sau » wong sam, wong siu, wong shiu
hong yu » wong yue
wang » 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 or wing) hyoung kong ((der kein) or (der keim)) zhang ping ((wong sau) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wing) hyoung kong ((der kein) OR (der keim)) zhang ping ((wong sau) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: (wang or wing) hyoung kong ((der kein) or (der keim)) zhang ping ((wong sau) or (hong yu)) ;*.