Perhaps you should try some spelling variations:
ratings risk » patients risk
among users » among ers, among peers, among masters
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
can lose » can close, can lost, can losers
can code » san code, can close, can erode
can cost » can costa, can lost, 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 liang yang ((((can lose) OR (can code))) OR (can cost)) ratings risk among users ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang yang ((((can lose) or (can code))) or (can cost)) ratings risk among users ;*.