Perhaps you should try some spelling variations:
device communication » services communication, voice communication, mobile communication
das developpement » des developpements, de developpement, du developpement
variation series » education series, action series, edition series
developpement en » developpement et, developpement des, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
series des » series de, series d, series e
des device » vs device, less devices, types device
a das » 1 das, 2 das, 3 das

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation series des device communication a das developpement en afrique.*.