Perhaps you should try some spelling variations:
rural credits » rural credit, total credits
training risk » trading risk, training visit, training work
training cost » training costs, training course, trading costs
dual credit » rural credit, equal credit, total credit
yang yang » wang yang, wang yan, wang yong
yang y » yang yi, yang d, yang y.c
cong » congo, long, hong

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang yang y ((dual credit) OR (rural credits)) ((training risk) or (training cost)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang y ((dual credit) OR (rural credits)) ((training risk) OR (training cost)) cong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang y ((dual credit) OR (rural credits)) ((training risk) or (training cost)) cong shu ;*".