Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
risk coping » risk pooling
huang yang » huang ying, huang chang, wang yang
risk cost » risk case
hua yang » hui yang, hua jiang, apa yang
hui cost » eu cost, ii cost, run cost
wang » wing, wan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wang OR lang) ((hua yang) or (huang yang)) hui cost ratings ((risk cost) or (risk coping)) shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR lang) ((hua yang) OR (huang yang)) hui cost ratings ((risk cost) OR (risk coping)) shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang OR lang) ((hua yang) or (huang yang)) hui cost ratings ((risk cost) or (risk coping)) shu ;*".