Perhaps you should try some spelling variations:
ratings risk » patients risk
can costa » can cost, can postal, da costa
yan yang » yang yang, yao yang, dan yang
can post » can cost, can lost, can past
wai yan » wang yan, wei yang
eu cost » au costa, der cost, end cost
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: wai yan yang ((((eu cost) or (can costa))) or (can post)) ratings risk ((how shu) or (how she)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wai yan yang ((((eu cost) OR (can costa))) OR (can post)) ratings risk ((how shu) OR (how she)) ;.
• Adding a wildcard symbol may retrieve word variants: wai yan yang ((((eu cost) or (can costa))) or (can post)) ratings risk ((how shu) or (how she)) ;*.