Perhaps you should try some spelling variations:
verbal communication » nonverbal communication, virtual communication, oral communication
information centers » information contents, information officers
technologien 2 » technologies 2, technologien _, technologien 1
2.3 developing » 3.3 developing, 2.2 developing, 1.3 developing
centers 4 » centers _, center 4, centers 3
costs 2.3 » costs 4.2, costs 4.4
4 verbal » _ verbal, 3 verbal, a verbal

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

• Adding a wildcard symbol may retrieve word variants: technologien 2 information centers 4 verbal communication costs 2.3 developing _ africa.*.