Perhaps you should try some spelling variations:
equal credit » equity credit, rural credit, total credit
dual credit » rural credit, deals credit, du credit
scale congo » cake congo, state congo, scale change
yang yang » wang yang, wang yan
congo shu » cong shu
done sin » dong sin, done using, done so

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((done sin) or (yang yang)) a ((equal credit) OR (dual credit)) rating scale congo shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((done sin) OR (yang yang)) a ((equal credit) OR (dual credit)) rating scale congo shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((done sin) or (yang yang)) a ((equal credit) OR (dual credit)) rating scale congo shu ;*".