Perhaps you should try some spelling variations:
ratings risk » patients risk
bond ratings » bond trading
risk coping » risk pooling
coping shu » cong shu
hua bond » a bond, hua ban, un bond
nan yan » wang yan, qian yan, dan yang
nan ya » nana yaa

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong ((nan ya) OR (nan yan)) hua bond ratings risk coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong ((nan ya) OR (nan yan)) hua bond ratings risk coping shu ;".
• Adding a wildcard symbol may retrieve word variants: dong ((nan ya) OR (nan yan)) hua bond ratings risk coping shu ;*.