Perhaps you should try some spelling variations:
benefit when » benefits whom, benefit plan, benefit area
wang dong » wang yong, wang hong, wang yang
best when » bent when, best what, debt when
using sar » using sat, using svr, using smart
yang jui » yang judy, yang di, yang xi
yang li » yang lin, yang di, yang xi

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 ((yang li) or (yang jui)) ((best when) or (benefit when)) when using sar ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang dong ((yang li) OR (yang jui)) ((best when) OR (benefit when)) when using sar ;.
• Adding a wildcard symbol may retrieve word variants: wang dong ((yang li) or (yang jui)) ((best when) or (benefit when)) when using sar ;*.