Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
developing urban » development urban, developing human, developing areas
technologies 4 » technologies _
3.2 developing » 3.3 developing, 2.2 developing, 3 developing
4 information » 2 information, 1 information
contents 3.4 » contents 3.1, contents 3.2, contents 4.4
urban africa » urban area
cost 3.2 » cost 2.4
3.4 de » 3.4 die, 3.4 der, 3.4 den

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 information contents 3.4 de communication cost 3.2 developing urban africa.*.