Perhaps you should try some spelling variations:
developpement durable » developpement de
oral communication » personal communication
leur developpement » le developpement, deux developpements, de developpement
typologie die » typologie des, typologie der, theologie die
die variation » de variation, does variation, der variation
die oral » die moral, die orte

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

• Adding a wildcard symbol may retrieve word variants: typologie die variation _ die oral communication a leur developpement durable afrique.*.