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
typologien de » typologien der, typologie des, typologie der
does vertical » ones vertical, forest vertical, boost vertical
de variation » der variation, die variation, does variation
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: typologien de variation among does vertical communication media _ developpement l afrique.*.