Perhaps you should try some spelling variations:
vertical communication » verbal communication, virtual communication, optical communication
variation among » starvation among, formation among, variation von
developpement l » developpement il, developpement la, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
does vertical » ones vertical, forest vertical, boost vertical
among does » among boys, among les, among donors
l afrique » en afrique

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation among does vertical communication media _ developpement l afrique.*.