Perhaps you should try some spelling variations:
ratings risk » patients risk
lost ratings » load ratings, lost earnings, bond ratings
wang wang » wang yang, wang liang, wang yong
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang wang) OR (wang yan)) yang can lost ratings risk among who ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang wang) OR (wang yan)) yang can lost ratings risk among who ;*.