Perhaps you should try some spelling variations:
mobile communications » mobile communication
communications costs » communication costs, communications _
information und » informations und
1.5 developing » 1.3 developing, 15 developing, 1.4 developing
a information » 2 information, 1 information
techniques a » techniques _, techniques 6, techniques 3
developing a » developing _
der mobile » der mobilen, der mobil, does mobile
costs 1.5 » costs 3.5, costs 2.5, costs 4.5

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

• Adding a wildcard symbol may retrieve word variants: techniques a information und der mobile communications costs 1.5 developing a real.*.