Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
des developpement » des developpements, de developpement, le developpement
des variation » does variation, de variation, der variation
variation des » variation _, variation 6, variation series
typology des » typologie des, typologie der, typology _
des afrique » en afrique, de l'afrique
des deas » des des, des degats, des delays
a des » a der, a das

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

• Adding a wildcard symbol may retrieve word variants: typology des variation des deas voice communication a des developpement des afrique.*.