Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
technologien aids » technologien als, technologien ad, technologien des
information 4.3.2 » information 4.3.3, information 2.3.2, information 3.2
aids information » chandos information, series information
4 developing » 3 developing
developing 4 » developing _, developing a, developing e
4 access » 2 access, 3 access
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologien aids information 4.3.2 _ mobile communications costs 4 developing 4 access.*.