Perhaps you should try some spelling variations:
federal transfers » central transfers, fiscal transfers
transfers system » transfer system, transfer systems, transport system
do federal » cbo federal, der federal, des federal
system cas » system case, system can, systems case
soil heat » soil health
aguas do » aguas de, aguas del
4 cao » 4 ao, 4 cas, _ cao
4 can » _ can, 3 can

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: (( aguas do federal transfers system cas ) OR ( aguas soil heat transfer ((4 cao) OR (4 can)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( aguas do federal transfers system cas ) or ( aguas soil heat transfer ((4 cao) OR (4 can)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( aguas do federal transfers system cas ) or ( aguas soil heat transfer ((4 cao) OR (4 can)) ))*.