Perhaps you should try some spelling variations:
transport firms » transport fares, transport fuels, transport air
use transport » mule transport, bus transport, sea transport
areas coal » areas can, areas co
firms a » firms _
de cast » de cas, de caso, de castro
de casi » de cas, de caso, de cause

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: (( areas coal use transport firms a ) OR ( guias ((de cast) OR (de casi)) transfer _ ao ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( areas coal use transport firms a ) or ( guias ((de cast) OR (de casi)) transfer _ ao ))~".
• Adding a wildcard symbol may retrieve word variants: (( areas coal use transport firms a ) or ( guias ((de cast) OR (de casi)) transfer _ ao ))*.