Perhaps you should try some spelling variations:
trading cost » trading costs, training cost, trading case
dual credit » rural credit, equal credit, rural credits
cost coping » post coping, cost computing, cost housing
hua credit » a credit, rural credit, equal credit
ida credit » ida credits, a credit
yang yang » wang yang, wang yan, wang yong

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 yala ((((hua credit) OR (dual credit))) or (ida credit)) trading cost coping shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang yala ((((hua credit) OR (dual credit))) OR (ida credit)) trading cost coping shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang yala ((((hua credit) OR (dual credit))) or (ida credit)) trading cost coping shu ;*".