Perhaps you should try some spelling variations:
ratings risk » patients risk
patient risk » patients risk, patient task, patient cost
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
jui cost » eu cost, run cost
among eu » among men, among _, among 15
ii cost » ii cos, ii cross, di costo

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 liang yang ((jui cost) OR (ii cost)) ((ratings risk) OR (patient risk)) among eu ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang yang ((jui cost) or (ii cost)) ((ratings risk) or (patient risk)) among eu ;*.