Perhaps you should try some spelling variations:
equal credit » dual credit, equity credit, rural credit
trading case » trading costs, trade case
hua credit » dual credit, a credit, du credit
wang yang » wang yan, wang liang, wang yanling
case cost » cases cost, case case, use cost
cost shu » host shut
yang ya » yang yao, yang yi, yang ka

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ya ((hua credit) or (equal credit)) trading case cost shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ya ((hua credit) OR (equal credit)) trading case cost shu ;.
• Adding a wildcard symbol may retrieve word variants: wang yang ya ((hua credit) or (equal credit)) trading case cost shu ;*.