Perhaps you should try some spelling variations:
formal transfer » informal transfers, social transfer, fiscal transfer
transfer costs » transport costs, transfer amounts
transport a » transport _, transport data
costs ch » costs cash, costs chap, costs _
le rural » use rural, one rural, 2 rural
a cas » a case, a cash, a casa

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 _ formal transfer costs ch ) OR ( langages ((le rural) OR (a rural)) transport a cas ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( aguas _ formal transfer costs ch ) or ( langages ((le rural) OR (a rural)) transport a cas ))~".
• Adding a wildcard symbol may retrieve word variants: (( aguas _ formal transfer costs ch ) or ( langages ((le rural) OR (a rural)) transport a cas ))*.