Perhaps you should try some spelling variations:
ratings risk » patients risk
savings risk » savings cross, savings rate, savings bank
liang yang » liang ying, wang yang, huang yang
yang yang » wang yang, wang yan
among hui » among heis, among eu, tong hui
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) or (yang yang)) can cost ((savings risk) OR (ratings risk)) among hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang yang) OR (yang yang)) can cost ((savings risk) OR (ratings risk)) among hui ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) or (yang yang)) can cost ((savings risk) OR (ratings risk)) among hui ;".
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (yang yang)) can cost ((savings risk) OR (ratings risk)) among hui ;*.