Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
des developpement » des developpements, de developpement, le developpement
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
des afrique » en afrique, de l'afrique
6 dem » _ dem, 6 de, a dem
6 der » _ der, 2 der, 3 der
a des » a der, a das

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie der variation ((6 dem) OR (6 der)) voice communication a des developpement des afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie der variation ((6 dem) OR (6 der)) voice communication a des developpement des afrique.*.