Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information 15.2 » information 1.5.2, information 1.2, information 1.3
technologien 1 » technologies 1, technologien _, technologien 4
4 developing » 3 developing
1 personal » a personal, 4 personal, 1945 personal
costs 4 » costs _, costs a, costs 4.2
15.2 1 » 15.2 _, 15.2 a

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

• Adding a wildcard symbol may retrieve word variants: technologien 1 information 15.2 1 personal communication costs 4 developing _ real.*.