Perhaps you should try some spelling variations:
information centers » information contents, information officers
oral communication » personal communication
technologien dis » technologien des, technologien als, technologien im
dis information » mis information, aids information, des informations
2.3 developing » 3.3 developing, 2.2 developing, 1.3 developing
developing 1 » developing _, developing a, developing e
centers 10 » centers _, center 1, center 12
costs 2.3 » costs 4.2, costs 4.4
10 oral » 10 moral, 1 oral, 14 oral

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

• Adding a wildcard symbol may retrieve word variants: technologien dis information centers 10 oral communication costs 2.3 developing 1 africa.*.