Perhaps you should try some spelling variations:
oral communication » personal communication
information costs » information contents, information centers, information content
technologien als » technologien des, technologien fur, technologien und
als information » als informations, aids information, laws information
2.1 development » 3.1 development, 2.3 development, 2.2 development
costs user » costs used, costs uses, cost users
costs 2.1 » costs 2.3, costs 4.1, costs 2.2
1 access » 10 access, 12 access, 14 access

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

• Adding a wildcard symbol may retrieve word variants: technologien als information costs user oral communication costs 2.1 development 1 access.*.