Perhaps you should try some spelling variations:
longo john » kong john, wong john
wang yang » wang yan, wang liang, wang yanling
yang xuan » wang xuan, yang guang, yang dean
hua irene » hua ren
xuan hua » tuan hua, xuan thuy, tan hua
yang jie » yang jin, yang di, yang jui
wong sam » wong sau, wong lai, kong sar

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 yang xuan hua irene ((yang jie) OR (longo john)) ((wong sam) OR (kong (sar OR saur))) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang xuan hua irene ((yang jie) or (longo john)) ((wong sam) or (kong (sar or saur))) ;*.