Perhaps you should try some spelling variations:
rural communication » rural communications, oral communication, moral communication
technologie die » technologie de, technologie im, technologie der
network models » network model, network modelling
4.1 developing » 3.1 developing, 4 developing, 3.3 developing
die transport » de transport, time transport, le transport
models rural » modern rural, homes rural
costs 4.1 » costs 4.2, costs 4.4, costs 4.3

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

• Adding a wildcard symbol may retrieve word variants: technologie die transport network models rural communication costs 4.1 developing _ areas.*.