Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information costs » information contents, information centers, information content
2.1 development » 3.1 development, 2.3 development, 2.2 development
technologies 4 » technologies _
4 information » 2 information, 1 information
development 2 » development 1, development 2.1, development 2.3
der personal » der personalen, der personen, der person
costs der » costs differ
costs 2.1 » costs 2.3, costs 4.1, costs 2.2
2 access » 3 access

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 information costs der personal communication costs 2.1 development 2 access.*.