Perhaps you should try some spelling variations:
ratings risk » patients risk
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
jun cost » run cost, eu cost
can cost » can costa, can lost, can post
how shu » how shih, how slum
how she » how some, how safe, how shih

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 ((jun cost) or (can cost)) ratings risk ((how shu) OR (how she)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang ((jun cost) OR (can cost)) ratings risk ((how shu) OR (how she)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang yang ((jun cost) or (can cost)) ratings risk ((how shu) OR (how she)) ;".
• Adding a wildcard symbol may retrieve word variants: wang liang yang ((jun cost) or (can cost)) ratings risk ((how shu) OR (how she)) ;*.