Perhaps you should try some spelling variations:
information centers » information contents, information officers
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
developing urban » development urban, developing human, developing areas
technologie und » technologies 2.1
und information » fund information, road information, award information
12.4 developing » 1.4 developing, 2.2 developing, 1.3 developing
urban africa » urban area
centers 3.3 » centers 3.8, centers 4.3, century 3.3
cost 12.4 » coast 12.4, costs 12.4, cost 2.4
3.3 de » 3.3 die, 3.3 der, 3.3 dem

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

• Adding a wildcard symbol may retrieve word variants: technologie und information centers 3.3 de communication cost 12.4 developing urban africa.*.