Perhaps you should try some spelling variations:
ratings risk » patients risk
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
can cost » can costa, can lost, chain cost
can post » can lost, can past, can postal
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: wang wang yang ((((eu cost) or (can cost))) or (can post)) ratings risk ((how shu) OR (how she)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang ((((eu cost) OR (can cost))) OR (can post)) ratings risk ((how shu) OR (how she)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang ((((eu cost) or (can cost))) or (can post)) ratings risk ((how shu) OR (how she)) ;".
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((((eu cost) or (can cost))) or (can post)) ratings risk ((how shu) OR (how she)) ;*.