Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang tran » nang trang, yang dean, yang fan
yang john » young john, king john, yang jin
hua chen » yu chen, a chen, hua ren
jui chen » yi chen
wong sau » wong siu, wong shiu, wong lai
wong sam » wong lai, kong sar, von sam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang tran ((hua chen) or (jui chen)) yang john ((wong sau) OR (wong sam)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang tran ((hua chen) OR (jui chen)) yang john ((wong sau) OR (wong sam)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang tran ((hua chen) or (jui chen)) yang john ((wong sau) OR (wong sam)) ;".
• Adding a wildcard symbol may retrieve word variants: wang yang tran ((hua chen) or (jui chen)) yang john ((wong sau) OR (wong sam)) ;*.