Perhaps you should try some spelling variations:
chen rong » chen yang
rong john » wrong john, kong john, wong john
john wong » john song, john bonn
wing tan » wing ian, liang tan, hong tan
yang yue » wang yue, yang yun, yang jui
wong sar » kong sar, wong sam, wong sau
yang yu » yang yun, yang yi, sang yu

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

• Performing a fuzzy search may retrieve terms with similar spellings: wing tan ((yang yu) or (yang yue)) chen rong john wong sar ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wing tan ((yang yu) OR (yang yue)) chen rong john wong sar ;.
• Adding a wildcard symbol may retrieve word variants: wing tan ((yang yu) or (yang yue)) chen rong john wong sar ;*.