Perhaps you should try some spelling variations:
information centers » information contents, information officers
communications cost » communications costs, communications cross, communication costs
de communications » de communication, do communications, mce communications
developing urban » development urban, developing human, developing areas
technologies 2 » technologies _, technologies 4
1.4 developing » 12.4 developing, 1.3 developing, 14 developing
urban africa » urban area
centers 3.1 » center 3.1, centers 3.3, centers 3.8
cost 1.4 » cost 14.4, cost 2.4, cost 1.2
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 cost 1.4 developing urban africa.*.