Perhaps you should try some spelling variations:
transport cost » transport costs
data transfer » cash transfer, heat transfer
key idea » key ideas, very idea, key item
de idea » new idea, one idea
cost cs » cost lcc
de data » e data, wide data, de datos
schaum » schaus

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vague ((de idea) OR (key idea)) transport cost cs ) or ( guia de data transfer from schaum ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vague ((de idea) OR (key idea)) transport cost cs ) OR ( guia de data transfer from schaum ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( vague ((de idea) OR (key idea)) transport cost cs ) or ( guia de data transfer from schaum ))*".