Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
can cost » can costa, can lost, can post
der cost » oder cost, user cost, debt cost
how slum » how slow, how sub, how sun
eu cost » au costa, end cost, eu court

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 ((can cost) or (((eu cost) or (der cost)))) patients risk how slum ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang ((can cost) OR (((eu cost) OR (der cost)))) patients risk how slum ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((can cost) or (((eu cost) or (der cost)))) patients risk how slum ;*.