Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
technologien does » technologien des, technologien als, technologie de
information 2.5.4 » information 2.5.3, information 3.5.4, information 12.2.4
does information » des informations, dis information, users information
developing farms » developing forms, developing forest, developing areas
4 developing » 3 developing
farms across » firms across, reforms across, flows across
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 does information 2.5.4 _ mobile communications costs 4 developing farms across.*.