Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
information centre » information centers, information contents
technologies 2.1 » technologies _, technologies 4, technologies a
de communication » mobile communication, online communication
2.1 information » 3.1 information
developing city » developing cities, developing data, developing high
12 developing » 1.2 developing, 2 developing, 1 developing
city africa » china africa, cults africa
centre i » centre _, centre a, centre c
cost 12 » cost 1.2, cost 15, cost 3.2
i de » i die, i der, i den

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 centre i de communication cost 12 developing city africa.*.