Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
ratings risk » patients risk
dong wang » dong yang, hong wang, dong hoang
among shu » cong shu, among eu, among hr
among sex » among smes, among eu
hua cost » a cost, eu cost, run cost
wang ya » wang yan, wang yang, wang hua

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong wang ya hua cost ratings risk ((among shu) or (among sex)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong wang ya hua cost ratings risk ((among shu) OR (among sex)) ;.
• Adding a wildcard symbol may retrieve word variants: dong wang ya hua cost ratings risk ((among shu) or (among sex)) ;*.