Perhaps you should try some spelling variations:
ratings risk » patients risk
load ratings » load rating, bond ratings, oed ratings
risk wrong » risk among, risk along
wang wang » wang yang, wang liang, wang yan
wrong who » wrong why, wrong what, wrong when
yan yang » yang yang, yao yang, tan yang
dan yang » daun yang, tan yang, wang 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 ((yan yang) OR (dan yang)) load ratings risk wrong who ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang ((yan yang) OR (dan yang)) load ratings risk wrong who ;*.