Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
population matters » population centers, population center
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
matters trade » matter trade, charters trade, members trade
costs a » costs _, costs 4

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology _ population matters trade data communications costs a developpement en afrique.*.