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 3 » variation _, variation 6, variation 5
typology 6 » typology _, typology 4.1
der tropen » den tropen, der treppen, der open
3 der » 2 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 3 der tropen communication _ der developpement de l'afrique.*.