Perhaps you should try some spelling variations:
training costs » trading costs, training courses, training course
training cost » training course, trading costs, training courses
trading cost » trading costs, trading case
hua credit » dual credit, a credit, ida credit
dong yang » dong hoang, wang yang, yang yang
yang yala » yang yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong yang yala hua credit ((trading cost) or (((training cost) OR (training costs)))) coping shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang yala hua credit ((trading cost) OR (((training cost) OR (training costs)))) coping shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong yang yala hua credit ((trading cost) or (((training cost) OR (training costs)))) coping shu ;*".