Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developing farmers » developing areas, developing forms, developing managers
information costs » information contents, information centers, information content
technologien des » technologien fur, technologien und, technologies 2
des information » des informations, does information, dis information
4 developing » 3 developing
costs ii » costs iii, costs _, costs a
ii voice » ii voices, _ voice, a voice
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologien des information costs ii voice communication costs 4 developing farmers access.*.