Perhaps you should try some spelling variations:
voice communications » mobile communications, guinea communications, online communications
developpement et » developpement des, developpement de, development east
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
et afrique » en afrique, l afrique
a die » 3 die, _ die, 1 die

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 _ deas voice communications ((a die) OR (2 die)) developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie der variation _ deas voice communications ((a die) OR (2 die)) developpement et afrique.*.