Perhaps you should try some spelling variations:
lang yanling » wang yanling, wang yangming, zhang yunling
equal credit » equity credit, rural credit, total credit
trading cost » trading costs, training cost, trading case
dual credit » rural credit, deals credit, rural credits
cost coping » post coping, port coping, cost computing
coping shu » cong shu
du credit » de credit, 2 credit
yala » ayala, yale, ala

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