Perhaps you should try some spelling variations:
wang wang » wang yang, wang liang, wang yong
thuy chen » hua chen, zhu chen
chen wong » chen rong, chen wang, chen yong
wong john » wrong john, kong john, longo john
wong sam » wong sau, wong lai, wong max
von sam » von sa, von sap, von scham
sar » sara, star, saur

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang wang) OR (wang yan)) xuan thuy chen wong john ((((wong sam) or (von sam))) or (kong sar)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang wang) OR (wang yan)) xuan thuy chen wong john ((((wong sam) OR (von sam))) OR (kong sar)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang wang) OR (wang yan)) xuan thuy chen wong john ((((wong sam) or (von sam))) or (kong sar)) ;*".