Perhaps you should try some spelling variations:
developpement durable » developpement de
oral communication » personal communication
leur developpement » le developpement, deux developpements, de developpement
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does 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 de variation _ die oral communication a leur developpement durable afrique.*.