Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
technologien does » technologien des, technologien als, technologie de
does information » des informations, dis information, users information
information bank » information b, information 2, information 1
developing asian » developing asia, developing human, developing areas
4.1 developing » 3.1 developing, 4 developing, 3.3 developing
asian areas » asian arab, aside areas, basin areas
und voice » one voice
costs 4.1 » costs 4.2, costs 4.4, costs 4.3
bank und » bank fund, banken und, bank under

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

• Adding a wildcard symbol may retrieve word variants: technologien does information bank und voice communication costs 4.1 developing asian areas.*.