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, chain cost
can post » can lost, can past, can postal
how shu » how she, how shih, how slum

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