Perhaps you should try some spelling variations:
information centers » information contents, information officers
oral communication » personal communication
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
7.3 developing » 3.3 developing, 1.3 developing, 2.2 developing
developing em » developing e, developing eq, developing amp
centers de » centers _, centres de, centers 10
costs 7.3 » costs 2.3, costs 4.3, costs 5.3
em africa » 1 africa
de oral » de otras, new oral

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

• Adding a wildcard symbol may retrieve word variants: technologien des information centers de oral communication costs 7.3 developing em africa.*.