Perhaps you should try some spelling variations:
training costs » trading costs, training courses, training course
training cost » training course, training courses
zhang zhi » zhong zhi, wang zhi, zhang wei
wing yan » wang yan, wing ian, wing tan
dong bin » dong sin, dong di, dann bin
ya a » a a, y a, ye a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wing yan) OR (dong bin)) ya a bank ((training cost) OR (training costs)) zhang zhi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wing yan) or (dong bin)) ya a bank ((training cost) OR (training costs)) zhang zhi ;~".
• Adding a wildcard symbol may retrieve word variants: ((wing yan) or (dong bin)) ya a bank ((training cost) OR (training costs)) zhang zhi ;*.