Perhaps you should try some spelling variations:
oral communication » personal communication
leur developpement » le developpement, deux developpements, de developpement
developpement de » developpement des, developpement durable
des variation » does variation, de variation, der variation
rates oral » rates formal, rates rural, rates brazil
de afrique » de l'afrique, en afrique, l afrique
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 _ rates oral communication a leur developpement de afrique.*.