Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
die developpement » de developpement, le developpement, du developpement
developpement en » developpement et, developpement des, developpement de
variation des » variation _, variation 6, variation series
ideologie de » ideologie der, ideologie des, ideologie du
de variation » der variation, die variation, does variation
delays voice » delays five
des delays » des deas, des degats, des deltas
a die » 2 die, 3 die, _ die

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

• Adding a wildcard symbol may retrieve word variants: ideologie de variation des delays voice communication a die developpement en afrique.*.