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
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 east ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang yang can cost ((ratings risk) OR (patients risk)) among east ;*".