Perhaps you should try some spelling variations:
ratings risk » patients risk
cost ratings » cost savings, costs savings, bond ratings
liang yang » liang ying, wang yang, yang yang
huang ying » huang ting, huang yang, huang bin
huang jing » huang ting, wang jing, huang bin
jie cost » die cost, time cost, diet cost
among eu » among men, among _, among 15

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: wang ((liang yang) OR (((huang ying) OR (huang jing)))) jie cost ratings risk among eu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) or (((huang ying) OR (huang jing)))) jie cost ratings risk among eu ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (((huang ying) OR (huang jing)))) jie cost ratings risk among eu ;*.