Perhaps you should try some spelling variations:
treppen communication » written communication, open communication, preplay communication
leur developpement » le developpement, deux developpements, de developpement
developpement de » developpement des, developpement durable
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
variation 5 » variation _, variation 6, variation a
der treppen » der gruppen, der tropen
5 der » _ der, 2 der, 3 der

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

• Adding a wildcard symbol may retrieve word variants: typology de variation 5 der treppen communication _ leur developpement de l'afrique.*.