Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information costs » information contents, information centers, information content
technologies 2 » technologies _, technologies 4
3.5 developing » 3.3 developing, 3.2 developing, 1.5 developing
das personal » des personal, des personals, haus personal
costs das » costs case, costs cash, costs data
costs 3.5 » costs 4.2, costs 4.4, costs 2.3

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information costs das personal communication costs 3.5 developing _ access.*.