Perhaps you should try some spelling variations:
equity credit » liquidity credit
equal credit » dual credit, rural credit, total credit
trading cost » trading costs, training cost, trading case
cost coping » post coping, port coping, cost computing
coping shu » cong shu
lang yan » wang yan, wang yang, zhang yan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: lang yan yala ((equal credit) OR (equity credit)) trading cost coping shu ;~.
• Adding a wildcard symbol may retrieve word variants: lang yan yala ((equal credit) or (equity credit)) trading cost coping shu ;*.