Perhaps you should try some spelling variations:
ratings risk » patients risk
yan yang » yang yang, yao yang, dan yang
jun cost » run cost, can cost, eu cost
can lost » can cost, can lose, can boost
can post » can cost, can past, can postal
how she » how some, how safe, how shih
wang » wing, wan, lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yang ((((jun cost) or (can lost))) or (can post)) ratings risk how she ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yang ((((jun cost) OR (can lost))) OR (can post)) ratings risk how she ;.
• Adding a wildcard symbol may retrieve word variants: wang yan yang ((((jun cost) or (can lost))) or (can post)) ratings risk how she ;*.