Perhaps you should try some spelling variations:
ratings risk » patients risk
cost ratings » cost savings, costs savings, bond ratings
among east » among breast, among health
wang yang » wang yan, wang yanling
among ers » among peers, among users, among heis
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (wang liang)) yang can cost ratings risk ((among east) OR (among ers)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (wang liang)) yang can cost ratings risk ((among east) or (among ers)) ;*.