Perhaps you should try some spelling variations:
trading cost » trading costs, training cost, trading case
cost coping » post coping, port coping, cost computing
ida credit » a credit, de credit, du credit
coping shu » cong shu
yang yang » wang yang, wang yan
yang all » wang all, yang dali, yang li

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 all ((ida credit) OR (ida credits)) trading cost coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang all ((ida credit) OR (ida credits)) trading cost coping shu ;*".