Perhaps you should try some spelling variations:
developpement du » developpement de, developpement des, developpement et
4 communication » 3 communication, 5.4 communication, de communication
4 developpement » de developpement, le developpement, et developpement
rate space » state space, trace space, safe space
du afrique » en afrique, l afrique, de l'afrique
space 4 » space _, space a, space 1
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology _ inflation rate space 4 communication costs 4 developpement du afrique.*.