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 ers, among health
can post » can cost, can past, can postal
can lost » can cost, can lose, can boost

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