Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications cross » communication cross, communications costs, communication across
6 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
informal 3.4.5 » informal 4.2, informal 8.4
die mobile » does mobile, das mobile, day mobile
3.4.5 die » 3.4.1 die, 3.4.2 die, 3.2.5 die
l afrique » en afrique
cross 6 » cross _, cross 1, cross c

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

• Adding a wildcard symbol may retrieve word variants: technology from informal 3.4.5 die mobile communications cross 6 developpement l afrique.*.