Perhaps you should try some spelling variations:
ratings risk » patients risk
load ratings » load rating, bond ratings, oed ratings
wang liang » wang yang
risk wrong » risk among, risk along
wang wang » wang yang, wang yan, wang yong
wrong who » wrong why, wrong what, wrong when
yan yang » yang yang, yao yang, dan yang

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 liang)) yan yang load ratings risk wrong who ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang wang) OR (wang liang)) yan yang load ratings risk wrong who ;*.