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