Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
der developpement » de developpement, des developpements, leur developpement
ideologie der » ideologie und, typologie der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
des afrique » en afrique, de l'afrique
des deas » des des, des degats, des delays

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

• Adding a wildcard symbol may retrieve word variants: ideologie der variation des deas voice communication _ der developpement des afrique.*.