Perhaps you should try some spelling variations:
yan guang » yang guang, yan guan, gan guan
guang hua » wang hua, gang hu, guang eu
yuen ping » chen ping, fun ping, xue ping
ren ping » chen ping, fun ping, he ping
wong sam » wong sau, wong lai, von sam
wang » wing, wan, lang
sar » sara, star, saur

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: wang yan guang hua ((ren ping) OR (yuen ping)) john ((wong sam) OR (kong sar)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan guang hua ((ren ping) OR (yuen ping)) john ((wong sam) or (kong sar)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan guang hua ((ren ping) OR (yuen ping)) john ((wong sam) or (kong sar)) ;*.