Perhaps you should try some spelling variations:
transportation network » transport network
model communicators » modern communicators, modern communicator, modern communications
communicators costs » communications costs, communication costs, communications cross
3.5 developing » 3.3 developing, 3.2 developing, 1.5 developing
developing a » developing _
based model » based models, based modeling
costs 3.5 » costs 4.2, costs 4.4, costs 2.3
a areas » 1 areas, 2 areas, 4 areas

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

• Adding a wildcard symbol may retrieve word variants: technologie _ transportation network based model communicators costs 3.5 developing a areas.*.