Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
among east » among breast, among health
among ers » among peers, among users, among heis
yang can » yang fan, yang dean, yang yang
can post » can cost, can lost, can past

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 can post ((ratings risk) OR (patients risk)) ((among east) OR (among ers)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang yang can post ((ratings risk) or (patients risk)) ((among east) OR (among ers)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang yang can post ((ratings risk) or (patients risk)) ((among east) OR (among ers)) ;*.