Perhaps you should try some spelling variations:
rural credits » rural credit, total credits
costs keeping » cows keeping, fronts keeping, worth keeping
dual credit » rural credit, deals credit, equal credit
keeping shu » keeping your, keeping them, keeping what
dong yang » dong hoang, yang yang, dan yang
wang yang » wang yan, wang liang, wang yanling

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: ((dong yang) OR (wang yang)) yang ((dual credit) OR (rural credits)) trading costs keeping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) OR (wang yang)) yang ((dual credit) or (rural credits)) trading costs keeping shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((dong yang) OR (wang yang)) yang ((dual credit) or (rural credits)) trading costs keeping shu ;*.