Perhaps you should try some spelling variations:
chen ping » chen rong, chen yang, chen wang
ping john » king john, kong john, wong john
wong laid » wong lai, kong land
wang thu » trang thu, wang chau, wang chun
thu tran » thuy tran, zhu tian
tran yu » tian yu, tran duc
yu chen » yu cheng, yi chen, yulu chen

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang thu tran yu chen ping john ((kong sar) or (wong laid)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang thu tran yu chen ping john ((kong sar) OR (wong laid)) ;.
• Adding a wildcard symbol may retrieve word variants: wang thu tran yu chen ping john ((kong sar) or (wong laid)) ;*.