Perhaps you should try some spelling variations:
trading risk » trading case, trading cost, sharing risk
dual credit » rural credit, equal credit, rural credits
hua credit » a credit, ida credit, rural credit
yang yang » wang yang, wang yan, wang yong
risk cong » risk coping, risk among
dong » doing, long, done

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

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