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
typologies des » typologie des, typologie der, typologien der
des variations » les variations, does variation, its variations
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: typologies des variations _ deas voice communication a de developpement en afrique.*.