Perhaps you should try some spelling variations:
dual credit » rural credit, deals credit, equal credit
hua credit » a credit, du credit, ida credit
costs cong » costs along, costs among, costs cost
de credit » du credit, 2 credit, trade credit
lang yan » wang yan, wang yang, zhang yan
yan yao » yang yao, gang yao, yan yuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang yan yao ((((hua credit) or (de credit))) or (dual credit)) trading costs cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan yao ((((hua credit) OR (de credit))) OR (dual credit)) trading costs cong shu ;.
• Adding a wildcard symbol may retrieve word variants: lang yan yao ((((hua credit) or (de credit))) or (dual credit)) trading costs cong shu ;*.