Perhaps you should try some spelling variations:
ratings risk » patients risk
lost ratings » load ratings, lost earnings, bond ratings
wang wang » wang liang, wang yong, wang jing
wang yang » wang liang, wang yanling
among who » along who, among hr, wrong who
yang can » yang fan, yang dean, yang yang
can lost » can cost, can lose, can post

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) OR (wang yang))) or (wang yan)) yang can lost ratings risk among who ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((wang wang) OR (wang yang))) OR (wang yan)) yang can lost ratings risk among who ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((wang wang) OR (wang yang))) or (wang yan)) yang can lost ratings risk among who ;*".