Perhaps you should try some spelling variations:
deals credit » dealer credit, des credit, dual credit
trading case » trading costs, trade case
hua credit » dual credit, a credit, du credit
wang yang » wang yan, wang liang, wang yanling
case cong » case cost
yang yi » yang di, yang xi, yang jui

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 yi ((hua credit) or (deals credit)) trading case cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yi ((hua credit) OR (deals credit)) trading case cong shu ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yi ((hua credit) or (deals credit)) trading case cong shu ;*.