Perhaps you should try some spelling variations:
developpement durable » developpement de
oral communication » personal communication
der developpement » de developpement, des developpements, leur developpement
communication 3 » communication _, communication a
variation uber » variationen uber, variation bei, variation der
topologie 4 » topologies 4, topologie 1, topologie 2
4 variation » 2 variation, 4 validation
uber den » uber die
den oral » den ort, new oral
3 der » _ der, 2 der

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

• Adding a wildcard symbol may retrieve word variants: topologie 4 variation uber den oral communication 3 der developpement durable afrique.*.