Perhaps you should try some spelling variations:
ratings risk » patients risk
cost ratings » cost savings, costs savings, bond ratings
risk cong » risk coping, risk among, risk along
hua yang » huang yang, hua jiang, apa yang
hui yang » hui ying, du yang, h yang
nu jiang » ru jiang, hua jiang, wu jian
hui cost » eu cost, ii cost, run cost

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wing ((((hua yang) OR (hui yang))) OR (nu jiang)) hui cost ratings risk cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: wing ((((hua yang) or (hui yang))) or (nu jiang)) hui cost ratings risk cong shu ;*.