Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
variation des » variation _, variation 6, variation series
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
des degats » des etats, des depots, des deas
a de » a die, a der, a des

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

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