Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
generation wages » generation age, reservation wages, generation rate
4 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
technology co » technology cost, technology code, technology can
co generation » coal generation, code generation, a generation
wages space » wages race
space 6.2 » spaces 6.2, space 3.2, space 2.2
l afrique » en afrique
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 co generation wages space 6.2 communication costs 4 developpement l afrique.*.