Perhaps you should try some spelling variations:
wang dong » wang yong, wang hong, want done
wang yang » wang yan, wang liang, wang yanling
hoang hai » hong hai, dang hai, hoang h
hai test » a test, hiv test
test yan » tests can
jiu wong » jim yong, ji won
wong sau » kong sar
yan jiu » yang jin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang dong) or (wang yang)) hoang hai test yan jiu wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang dong) OR (wang yang)) hoang hai test yan jiu wong sau ;.
• Adding a wildcard symbol may retrieve word variants: ((wang dong) or (wang yang)) hoang hai test yan jiu wong sau ;*.