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 2.2 » information 1.2, information 2.7, information 2.2.2
3 developing » 3 development
und voice » one voice
2.2 und » 2.2 une, 2.2 un, 1.2 und
costs 3 » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technologies used information 2.2 und voice communication costs 3 developing _ areas.*.