Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
wang yong » wang yang, wang hyoung, wang yan
yong yang » yang yang, dong yang, ying yang
among who » along who, among hr, wrong who
yang can » yang fan, yang dean, yang yang
can lost » can cost, can lose, can post

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yong yang can lost ((ratings risk) or (patients risk)) among who ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yong yang can lost ((ratings risk) OR (patients risk)) among who ;*.