Perhaps you should try some spelling variations:
wang dong » wang yong, wang yang, wang jing
wang hong » wang yong, wang hyoung, wang lihong
api test » i test, ii test
wong sau » wong sam, wong shiu, wong lai
wong siu » wong shiu, kong siu, wong siew
ai test » i test, ii test, ein test
yan jiu » yang jie, yang jin, pang jiu

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 hong)) yang ((ai test) OR (api test)) yan jiu ((wong sau) or (wong siu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang dong) OR (wang hong)) yang ((ai test) OR (api test)) yan jiu ((wong sau) OR (wong siu)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang dong) or (wang hong)) yang ((ai test) OR (api test)) yan jiu ((wong sau) or (wong siu)) ;".
• Adding a wildcard symbol may retrieve word variants: ((wang dong) or (wang hong)) yang ((ai test) OR (api test)) yan jiu ((wong sau) or (wong siu)) ;*.