Perhaps you should try some spelling variations:
5.1 communication » 4.1 communication, 1.1 communication, 3.1 communication
technologien fur » technologien des, technologien und, technologies 2
information case » information based, information can, information costs
fur information » zur information, fair information, your information
a developing » a development
developing 2 » developing _, developing a, developing e
costs a » costs _, costs 4
2 areal » 2 real, _ areal, 2 areas
case a » case 1, case 2, case 3
a 5.1 » a 4.1, a 6.1, a 2.1

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

• Adding a wildcard symbol may retrieve word variants: technologien fur information case a 5.1 communication costs a developing 2 areal.*.