Perhaps you should try some spelling variations:
oral communication » personal communication
des developpement » des developpements, de developpement, le developpement
developpement en » developpement et, developpement des, developpement de
des variation » does variation, de variation, der variation
variation des » variation _, variation 6, variation series
a des » a der, a das
typologie » typologies, typology

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

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