Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
leur developpement » le developpement, deux developpements, de developpement
developpement en » developpement et, developpement des, developpement de
variation des » variation _, variation 6, variation series
theologie de » theologie der, theologie des, theologie die
de variation » der variation, die variation, does variation
3 voice » 3 voices, _ voice, a voice
des 3 » des _

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

• Adding a wildcard symbol may retrieve word variants: theologie de variation des 3 voice communication a leur developpement en afrique.*.