Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
countries assessed » countries assessing, countries access, countries affected
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
information 1 » information 2, information 3, information 3.2
1 developing » 3 developing, 4 developing, 2 developing
5 voice » 5 voices, _ voice, a voice
costs 1 » 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: technologien des information 1 5 voice communication costs 1 developing countries assessed.*.