Perhaps you should try some spelling variations:
treppen communication » written communication, open communication, preplay communication
der developpement » de developpement, des developpements, leur developpement
developpement de » developpement des, developpement durable
la variation » la variacion, a variation, la validation
typology la » typology a, typology alma, typology _
variation 6 » variation _, variations _, variation des
der treppen » der gruppen, der tropen
6 der » 2 der, 3 der, 1 der

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

• Adding a wildcard symbol may retrieve word variants: typology la variation 6 der treppen communication _ der developpement de l'afrique.*.