Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologies 2.1 » technologies _, technologies 4, technologies a
de communication » mobile communication, online communication
2.1 information » 3.1 information
developing iv » developing av, developing ict, developing cil
contents 3.2 » content 3.2, contents 3.1, contexts 3.2
4 developing » 3 developing
iv africa » v africa, 1 africa, em africa
3.2 de » 3.2 die, 3.2 der, 3.2 dem
cost 4 » cost _, cost 2.4

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information contents 3.2 de communication cost 4 developing iv africa.*.