Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
technologies used » technologies based, technology used, technologies _
used information » user information, use information, based information
information 23 » information 2.3, information 2, information 3
3 developing » 3 development
und voice » one voice
costs 3 » costs _, costs 4, costs a
23 und » 13 und

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

• Adding a wildcard symbol may retrieve word variants: technologies used information 23 und voice communication costs 3 developing _ areas.*.