Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
among east » among breast, among ers, among health
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang can » yang fan, yang dean, yang yang
can cost » can costa, can lost, 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 wang yang can cost ((ratings risk) or (patients risk)) among east ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang can cost ((ratings risk) OR (patients risk)) among east ;*.