Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
information centers » information contents, information officers
de communications » de communication, do communications, mce communications
developing urban » development urban, developing human, developing areas
14.3 developing » 1.3 developing, 10.3 developing, 14.1 developing
technologies 2 » technologies _, technologies 4
urban africa » urban area
centers 3.1 » center 3.1, centers 3.3, centers 3.8
costs 14.3 » costs 4.3, costs 12.3, costs 15.3
3.1 de » 3.1 die, 3.1 der, 3.1 def

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 3.1 de communications costs 14.3 developing urban africa.*.