Perhaps you should try some spelling variations:
modern communication » modern communications, modern communicator, modeling communication
technologien gas » technologien des, technologien als, technologien am
network credit » network media, network creation
3.1 developing » 3.3 developing, 3.2 developing, 4.1 developing
gas transport » mass transport, bus transport, car transport
credit modern » credit model, credit models, credit money
costs 3.1 » costs 3.5, costs 4.1, costs 2.1

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

• Adding a wildcard symbol may retrieve word variants: technologien gas transport network credit modern communication costs 3.1 developing _ areas.*.