Perhaps you should try some spelling variations:
trading cost » trading costs, training cost
trading case » trading costs, trade case
hua credit » dual credit, a credit, du credit
coping shu » cong shu
dong yang » dong hoang, yang yang, dan yang
wang yang » wang yan, wang liang, wang yanling
yala hua » ya hua

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) OR (wang yang)) yala hua credit ((trading cost) or (trading case)) coping shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (wang yang)) yala hua credit ((trading cost) OR (trading case)) coping shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) OR (wang yang)) yala hua credit ((trading cost) or (trading case)) coping shu ;*".