Perhaps you should try some spelling variations:
cong van » congo can, duong van, cong sun
van wang » von wang, yan wang, qian wang
lee sang » lee ann
sang xin » zhang xin, sang minh, yang xi
tong hui » wang hui
wang wei » zhang wei, wang zhi
wang di » yang di, wang d, wang li
di lee » ii lee

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

• Performing a fuzzy search may retrieve terms with similar spellings: cong van wang di lee sang xin ((tong hui) or (wang wei)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cong van wang di lee sang xin ((tong hui) OR (wang wei)) ;*.