Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
de communication » mobile communication, online communication
technologies 2 » technologies _, technologies 4
12 developing » 1.2 developing, 2 developing, 1 developing
developing eq » developing e, developing egg, developing _
contents 3.2 » content 3.2, contents 3.1, contexts 3.2
eq africa » em africa, eu africa, 1 africa
cost 12 » cost 1.2, cost 15, cost 3.2
3.2 de » 3.2 die, 3.2 der, 3.2 dem

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information contents 3.2 de communication cost 12 developing eq africa.*.