Perhaps you should try some spelling variations:
training visit » training cost, training test
trading case » trading costs, leading cause, trading value
dong yang » dong hoang, yang yang
wang yang » wang yan, wang liang, wang yanling
a credit » _ credit, tax credit, bad credit
ya a » a a, ka a
hong » long

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)) ya a credit ((trading case) or (training visit)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (wang yang)) ya a credit ((trading case) OR (training visit)) hong yu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong yang) OR (wang yang)) ya a credit ((trading case) or (training visit)) hong yu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong yang) OR (wang yang)) ya a credit ((trading case) or (training visit)) hong yu ;*.