Perhaps you should try some spelling variations:
training cost » training costs, training course, training courses
trading cost » trading costs, trading case
wang liang » wang yang
yang swing » yang jing, yang using
brief what » brief when, bring what
dan yang » daun yang, tan yang, wang yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yan) or (wang liang)) dan yang swing ((trading cost) OR (training cost)) brief what ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yan) OR (wang liang)) dan yang swing ((trading cost) OR (training cost)) brief what ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yan) or (wang liang)) dan yang swing ((trading cost) OR (training cost)) brief what ;*".