Perhaps you should try some spelling variations:
wang zeng » wang zheng, wang peng, tang zheng
zeng doug » jeng dong, zeng douglas
wang yue » wong yue, wang yan, wang hui
yu chen » yu cheng, yulu chen, jui chen
yi chen » jui chen
ping ku » ping ke, ping yu
wang he » wang zhi, wang wei, wang hui

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang zeng doug ((yu chen) or (yi chen)) ping ku ((((wang he) or (wang hua))) or (wang yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang zeng doug ((yu chen) OR (yi chen)) ping ku ((((wang he) OR (wang hua))) OR (wang yue)) ;.
• Adding a wildcard symbol may retrieve word variants: wang zeng doug ((yu chen) or (yi chen)) ping ku ((((wang he) or (wang hua))) or (wang yue)) ;*.