Perhaps you should try some spelling variations:
ratings risk » patients risk
cost ratings » cost savings, costs savings, bond ratings
liang ying » liang liying, huang ying, zhang ying
yang yang » wang yang, wang yan
among men » among women
jie cost » die cost, time cost, diet cost
among eu » 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 ((yang yang) OR (liang ying)) jie cost ratings risk ((among eu) OR (among men)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang yang) or (liang ying)) jie cost ratings risk ((among eu) OR (among men)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yang yang) or (liang ying)) jie cost ratings risk ((among eu) OR (among men)) ;*.