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
zhang yan » zhang fan, zhang jian, wang yan
lang yan » wang yan, wang yang, yang yang

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) OR (zhang yan)) yala ((equal credit) OR (equity credit)) trading cost coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lang yan) OR (zhang yan)) yala ((equal credit) or (equity credit)) trading cost coping shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((lang yan) OR (zhang yan)) yala ((equal credit) or (equity credit)) trading cost coping shu ;*.