Perhaps you should try some spelling variations:
voice communications » mobile communications, guinea communications, online communications
der developpement » de developpement, des developpements, leur developpement
developpement en » developpement et, developpement des, developpement de
ideologie der » ideologie und, typologie der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
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 communications _ der developpement en afrique.*.