Perhaps you should try some spelling variations:
credit ratings » credit rating
ratings value » creating value, lasting value, making value
dual credit » rural credit, deals credit, equal credit
value cong » value co, value closing, value change
wang yang » wang yan, wang liang, wang yanling
a dual » _ dual

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: (((dong OR done) sin) OR (wang yang)) a dual credit ratings value cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: (((dong or done) sin) or (wang yang)) a dual credit ratings value cong shu ;*.