Perhaps you should try some spelling variations:
verbal communication » nonverbal communication, virtual communication, oral communication
technologien health » technology health, technologien als, technologies help
information centers » information contents, information officers
4 developing » 3 developing
centers et » centers _, centers 10, centers 21
et verbal » des verbal, _ verbal, 3 verbal
costs 4 » costs _, costs a, costs 4.2

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

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