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
yang yang » wang yang, wang yan
dan yang » daun yang, tan yang, wang yang

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

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