Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
among breast » among east, facing breast, among forest
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
yang can » yang fan, yang dean, yang yang
can cost » can costa, can lost, can post

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 cost ((ratings risk) or (patients risk)) among breast ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang can cost ((ratings risk) OR (patients risk)) among breast ;*.