Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
information costs » information contents, information centers, information content
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
technologies 1 » technologies _, technologies 4, technologies 2
costs 2.3 » costs 4.2, costs 4.4
2.3 voice » 2.1 voice, 2.4 voice, 2.3 choice
a a » a la

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

• Adding a wildcard symbol may retrieve word variants: technologies 1 information costs 2.3 voice communication a a developpement en afrique.*.