Perhaps you should try some spelling variations:
information centers » information contents, information officers
das communication » mass communication, c's communication, lea's communication
technologies 4 » technologies _
1.4 developing » 12.4 developing, 1.3 developing, 14 developing
4 information » 2 information, 1 information
centers 12.4 » centers 12.4.5, center 12.6, centers 2.2
developing 1 » developing _, developing a, developing e
costs 1.4 » costs 11.4, costs 12.4, costs 4.4
12.4 das » 1.2.4 das, 2.4 das, 1.4 das

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 information centers 12.4 das communication costs 1.4 developing 1 africa.*.