Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
information based » information case, information bank, transformation based
technologien 1 » technologies 1, technologien _, technologien 4
4 developing » 3 developing
den mobile » does mobile, open mobile, non mobile
based den » based debt, based deep, based new
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 1 information based den mobile communications costs 4 developing _ areas.*.