Perhaps you should try some spelling variations:
training based » tracking based, training basics, learning based
training case » training cost, training can, training course
yang yang » wang yang, wang yan
de credit » du credit, 2 credit, trade credit
hong yu » wong yue
a de » a die, a der, a des
dong » doing, long, done

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong sin) or (yang yang)) a de credit ((training case) OR (training based)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (yang yang)) a de credit ((training case) OR (training based)) hong yu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong sin) or (yang yang)) a de credit ((training case) OR (training based)) hong yu ;*".