Perhaps you should try some spelling variations:
device communication » services communication, voice communication, mobile communication
des developpement » des developpements, de developpement, le developpement
der variations » der variation, 1er variations, ier variations
typologie der » typologie des, ideologie der
des afrique » en afrique, de l'afrique
der device » der service, user device, user devices
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: typologie der variations _ der device communication a des developpement des afrique.*.