Perhaps you should try some spelling variations:
formal transport » informal transport, rural transport, local transport
local transfers » social transfers, fiscal transfers, local transport
langues africa » language africa, wages africa, andes africa
transfers de » transferts de, transfert de, transfers made
costs chap » costs ch, costs chapter
vs formal » vs informal, its formal, _ formal
aguas vs » agens vs, aguas de, aguas do
de caso » de casos, de cas, de castro

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 africa local transfers de caso ))~.
• Adding a wildcard symbol may retrieve word variants: (( aguas vs formal transport costs chap ) or ( langues africa local transfers de caso ))*.