Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
technology 4.2 » technology 2.2, technology 3.2, technology 4.1
de mobile » die mobile, e mobile, does mobile
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 4.2 information _ de mobile communications costs 4 developpement en afrique.*.