Perhaps you should try some spelling variations:
information centers » information contents, information officers
der communication » de communication, under communication, debt communication
technologies 2 » technologies _, technologies 4
1.4 developing » 12.4 developing, 1.3 developing, 14 developing
centers 3.3 » centers 3.8, centers 4.3, century 3.3
costs 1.4 » costs 11.4, costs 12.4, costs 4.4
3.3 der » 2.3 der, 4.3 der

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 3.3 der communication costs 1.4 developing _ africa.*.