Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
ratings risk » patients risk
wang yong » wang yang, wang hyoung, wang yan
yong yan » yang yang, dong yang, ying yang
can cost » can costa, can lost, can post
yan can » yan clan, man can, yan cong
hai » hadi, haji, hari

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 yong yan can cost ratings risk ((cong shu) OR (dang hai)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yong yan can cost ratings risk ((cong shu) or (dang hai)) ;*.