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

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang liang ((yang can) OR (yang fan)) lost ratings risk ((among east) or (among ers)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang ((yang can) OR (yang fan)) lost ratings risk ((among east) OR (among ers)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((yang can) OR (yang fan)) lost ratings risk ((among east) or (among ers)) ;*".