Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
developpement l » developpement il, developpement la, developpement de
6 variation » 6 variations, _ variation, 2 variation
typology 6 » typology _, typology 4.1
der voice » user voice, new voice
l afrique » en afrique
3 au » 3 auf, 3 zu, 3 eu

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: "typology 6 variation _ der voice communication ((3 au) OR (3 a)) developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology 6 variation _ der voice communication ((3 au) OR (3 a)) developpement l afrique.*.