Perhaps you should try some spelling variations:
social transfert » social transfers, social transfer, local transfers
formal transport » informal transport, rural transport, local transport
langues rica » langues la
transfert et » transfert de, transport et, transfer _
rica social » africa social, america social, african social
costs chap » costs ch, costs chapter
vs formal » vs informal, its formal, _ formal
aguas vs » agens vs, aguas de, aguas do
et caso » el caso, del caso, en casos

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 vs formal transport costs chap ) OR ( langues rica social transfert et caso ))~.
• Adding a wildcard symbol may retrieve word variants: (( aguas vs formal transport costs chap ) or ( langues rica social transfert et caso ))*.