Perhaps you should try some spelling variations:
developing concepts » development concepts, development concept, developing countries
oral communication » personal communication
information costs » information contents, information centers, information content
technologien ad » technologien am, technologien und, technologien als
concepts access » contents access
ad information » d information, nd information, od information
4 developing » 3 developing
costs der » costs differ
der oral » der moral, der ort, der orte
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 ad information costs der oral communication costs 4 developing concepts access.*.