Perhaps you should try some spelling variations:
training cost » training costs, training course, trading costs
trading risk » trading case, trading cost, sharing risk
dual credit » equal credit, rural credits, total credit
yang yang » wang yang, wang yan, wang yong
hong ghi » hong g, hong hai
yang y » yang yi, yang d, yang y.c

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 credit)) ((trading risk) or (training cost)) hong ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang y ((dual credit) OR (rural credit)) ((trading risk) OR (training cost)) hong ghi ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang y ((dual credit) OR (rural credit)) ((trading risk) or (training cost)) hong ghi ;*".