Perhaps you should try some spelling variations:
tropen communication » open communication, proper communication, spoken communication
der developpement » de developpement, des developpements, leur developpement
developpement de » developpement des, developpement durable
6 variation » 6 variations, _ variation, 2 variation
variation 1 » variations 1, variation _, variation 6
typology 6 » typology _, typology 4.1
der tropen » den tropen, der treppen, der open
1 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 6 variation 1 der tropen communication _ der developpement de l'afrique.*.