Perhaps you should try some spelling variations:
chen yang » chen rong
john kong » john king, john song, john bonn
john wong » john song, john bonn
wang yao » wang yan, yang yao, gang yao
yao yang » yang yang
yang yu » yang yue, yang yun, yang yi
yu chen » yu cheng, yi chen, yulu chen

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yao yang yu chen yang ((john kong) OR (john wong)) sar ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yao yang yu chen yang ((john kong) OR (john wong)) sar ;".
• Adding a wildcard symbol may retrieve word variants: wang yao yang yu chen yang ((john kong) OR (john wong)) sar ;*.