Perhaps you should try some spelling variations:
sectors communications » actors communication, secure communications, sensor communications
communications costs » communication costs, communications _
en developpement » et developpement, de developpement, le developpement
developpement l » developpement il, developpement la, developpement de
trade sectors » trade sector
l afrique » en afrique
social 4 » social _, social a
costs en » costs _, costs 4, costs a
4 trade » 1 trade

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

• Adding a wildcard symbol may retrieve word variants: methods overview social 4 trade sectors communications costs en developpement l afrique.*.