Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
ratings risk » patients risk
liang yang » liang ying, wang yang, huang yang
yang yang » wang yang, wang yan
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.

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