Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
variation series » education series, action series, edition series
developpement l » developpement il, developpement la, developpement de
des variation » does variation, de variation, der variation
series dix » series d, series de, series ein
l afrique » en afrique
a du » a d, a u, _ du
a de » a die, a der, a des
typologie » typologies, typology

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 des variation series dix voice communication ((a du) OR (a de)) developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie des variation series dix voice communication ((a du) OR (a de)) developpement l afrique.*.