Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
yang john » young john, king john, yang jin
yan xuan » yan guan, yan yuan, wang xuan
vu irene » _ irene
wong sau » wong siu, wong shiu, wong lai
wong sam » wong lai, kong sar, von sam
wang » wing, wan, lang

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 xuan) OR (yang guang)) vu irene yang john ((wong sau) OR (wong sam)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan xuan) or (yang guang)) vu irene yang john ((wong sau) OR (wong sam)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yan xuan) or (yang guang)) vu irene yang john ((wong sau) OR (wong sam)) ;*.