Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developpement et » developpement des, developpement de, development east
typologie does » typologie des, typologie der, typologie cices
does variation » de variation, der variation, die variation
et afrique » en afrique, l afrique
a des » a der
a das » 1 das, 2 das, 3 das

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 does variation _ deas voice communication ((a des) OR (a das)) developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie does variation _ deas voice communication ((a des) OR (a das)) developpement et afrique.*.