Perhaps you should try some spelling variations:
ratings risk » patients risk
lost ratings » load ratings, lost earnings, bond ratings
among east » among breast, among health
wang wang » wang yang, wang liang, wang yong
among ers » among peers, among users, among heis
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang wang) OR (wang yan)) yang can lost ratings risk ((among east) OR (among ers)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang wang) or (wang yan)) yang can lost ratings risk ((among east) OR (among ers)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang wang) or (wang yan)) yang can lost ratings risk ((among east) OR (among ers)) ;*.