Perhaps you should try some spelling variations:
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
variation among » starvation among, formation among, variation von
typologies des » typologie des, typologie der, typologien der
des variation » does variation, de variation, der variation
among does » among boys, among les, among donors
does oral » does formal, does oil

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

• Adding a wildcard symbol may retrieve word variants: typologies des variation among does oral communication media _ developpement en afrique.*.