Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information costs » information contents, information centers, information content
technologien ad » technologien am, technologien und, technologien als
4.3 development » 2.3 development, 1.3 development, 3.3 development
development 3.1 » development 1
ad information » d information, nd information, od information
4 personal » a personal, 1 personal, 1945 personal
3.1 access » 1.1 access, 3.2 access, 3.6 access
costs 4.3 » costs 4.2, costs 4.4, costs 2.3
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 4 personal communication costs 4.3 development 3.1 access.*.