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, can cost, eu cost
can past » can east, can fast, can post
can lost » can cost, can lose, can post
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 past) or (can lost)))) ratings risk how shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang ((jun cost) OR (((can past) OR (can lost)))) ratings risk how shu ;.
• Adding a wildcard symbol may retrieve word variants: wang liang yang ((jun cost) or (((can past) or (can lost)))) ratings risk how shu ;*.