Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
interaction have » interaction aware, interaction layer, interaction a
au developpement » du developpement, de developpement, le developpement
developpement du » developpement de, developpement des, developpement et
have trade » slave trade, have made
du afrique » en afrique, l afrique, de l'afrique
trade 3.2 » trade 2.2, trade 2, trade 4.1
costs au » costs a, costs amy, costs _

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

• Adding a wildcard symbol may retrieve word variants: technology _ interaction have trade 3.2 communication costs au developpement du afrique.*.