Perhaps you should try some spelling variations:
device communication » services communication, voice communication, mobile communication
leur developpement » le developpement, deux developpements, de developpement
developpement en » developpement et, developpement des, developpement de
typologien der » typologie der, typologie des, apologien der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
e device » _ device, a device, 4 device
des e » des _, des 3

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

• Adding a wildcard symbol may retrieve word variants: typologien der variation des e device communication a leur developpement en afrique.*.