Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
detection series » detection systems, detection system
4 developpement » de developpement, le developpement, et developpement
technology 15 » technology 1.5, technology 1, technology 5
15 detection » 1 detection, 14 detection, 19 detection
des afrique » en afrique, de l'afrique
series a » series _, series 1, series 2
a mobile » _ 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 15 detection series a mobile communications costs 4 developpement des afrique.*.