Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developed control » developing control, developed country, developed content
control assessing » context assessing, construct assessing, countries assessing
technologien ad » technologien am, technologien und, technologien als
ad information » d information, nd information, od information
information i » information im, information 2, information 1
4.1 developed » 4.5 developed, 5.1 developed, 6.1 developed
costs 4.1 » costs 4.2, costs 4.4, costs 4.3
ii voice » ii voices, _ voice, a voice

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

• Adding a wildcard symbol may retrieve word variants: technologien ad information i ii voice communication costs 4.1 developed control assessing.*.