Perhaps you should try some spelling variations:
longo john » wong john
kong john » king john, wong john, wrong john
yan xuan » yan guan, yan yuan, wang xuan
hua chen » jui chen, a chen, hua ren
wong sam » wong sau, wong lai, von sam
yu chen » yu cheng, yi chen, yulu chen
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 xuan ((hua chen) OR (yu chen)) ((kong john) OR (longo john)) ((wong sam) OR (kong sar)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan xuan ((hua chen) OR (yu chen)) ((kong john) or (longo john)) ((wong sam) or (kong sar)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan xuan ((hua chen) OR (yu chen)) ((kong john) or (longo john)) ((wong sam) or (kong sar)) ;*.