Perhaps you should try some spelling variations:
rating costs » trading costs, operating costs, training costs
risk rating » risk taking, risk sharing
dong skin » dong sin, dong bin
costs how » cost low
how shu » how slum
a risk » _ risk
ka a » a a, k a
wang » wing, wan, lang

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: ((wang yanling) OR (dong skin)) ka a risk rating costs how shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang yanling) or (dong skin)) ka a risk rating costs how shu ;*.