Perhaps you should try some spelling variations:
rating case » trading case, rating scale, heating case
dual credit » rural credit, deals credit, equal credit
case coping » career coping, change coping, case company
hua credit » a credit, du credit, ida credit
coping shu » cong shu
nan yan » nan ya, wang yan, qian yan
qian yi » qian yan

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong ((nan yan) or (qian yi)) ((hua credit) or (dual credit)) rating case coping shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong ((nan yan) OR (qian yi)) ((hua credit) OR (dual credit)) rating case coping shu ;.
• Adding a wildcard symbol may retrieve word variants: dong ((nan yan) or (qian yi)) ((hua credit) or (dual credit)) rating case coping shu ;*.