Perhaps you should try some spelling variations:
idea transport » ideas transport, sea transport, de transport
transport cost » transport costs
data transfer » cash transfer, heat transfer
vague key » value keys, sage key, vague de
key idea » key ideas, very idea, key item
cost cao » cost a, cost cs, cost dam
guia age » guia de
age data » wage data, cge data, image data
schaum » schaus

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: (( vague key idea transport cost cao ) OR ( guia age data transfer from schaum ))~.
• Adding a wildcard symbol may retrieve word variants: (( vague key idea transport cost cao ) or ( guia age data transfer from schaum ))*.