Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
4.2 communications » 4.2 communication, 3.2 communication, 6.2 communication
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
technology co » technology cost, technology code, technology can
co generation » coal generation, code generation, a generation
rate space » state space, trace space, safe space
space 4.2 » space 3.2, space 2.2, space 4.3
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 co generation rate space 4.2 communications costs a developpement en afrique.*.