Perhaps you should try some spelling variations:
yang yang » wang yan
wang yang » wang yan, wang liang, wang yanling
guang hua » wang hua, gang hu, guang eu
hua irene » hua ren
wong john » wrong john, kong john, longo john
kong sara » kong sar
wong sau » wong sam, wong siu, wong shiu

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: ((yang yang) OR (wang yang)) guang hua irene wong john ((wong sau) OR (kong sara)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (wang yang)) guang hua irene wong john ((wong sau) or (kong sara)) ;*.