Perhaps you should try some spelling variations:
equal credit » equity credit, rural credit, total credit
dual credit » rural credit, deals credit, du credit
hua credit » a credit, du credit, ida credit
costs cong » costs along, costs among, costs cost
wang yang » wang yan, wang liang, wang yanling
yang yi » yang di, yang xi, yang jui

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 yang yi ((hua credit) OR (((dual credit) OR (equal credit)))) trading costs cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang yi ((hua credit) or (((dual credit) or (equal credit)))) trading costs cong shu ;*.