Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
information centers » information contents, information officers
technologies 2 » technologies _, technologies 4
5.4 developing » 6.4 developing, 3.3 developing, 2.2 developing
developing v » developing av, developing _, developing a
centers 2 » centers 21, centers _, center 2
costs 5.4 » costs 4.4, costs 6.4, costs 2.4
2 mobile » _ mobile, a mobile
v africa » 1 africa, em africa

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information centers 2 mobile communications costs 5.4 developing v africa.*.