Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developpement et » developpement des, developpement de, development east
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
et afrique » en afrique, l afrique
des voice » new voice, des vices, des voies
des des » des deas, des dem, des der
a das » 1 das, 2 das, _ das
3 das » 1 das, 2 das

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

• Performing a fuzzy search may retrieve terms with similar spellings: typologie der variation des des voice communication ((a das) OR (3 das)) developpement et afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie der variation des des voice communication ((a das) OR (3 das)) developpement et afrique.*".