Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developpement l » developpement il, developpement la, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
variation 3 » variation _, variation 6, variation 5
das voice » das choice, a voice
l afrique » en afrique
3 das » 1 das, 2 das
2 le » 2 la, 2 de, 2 re

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie der variation 3 das voice communication ((2 le) OR (2 les)) developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie der variation 3 das voice communication ((2 le) OR (2 les)) developpement l afrique.*.