Perhaps you should try some spelling variations:
tropen communication » open communication, proper communication, spoken communication
leur developpement » le developpement, deux developpements, de developpement
developpement de » developpement des, developpement durable
6 variations » _ variations, 2 variations, 1 variations
variations 3 » variations _, variation 3, variations 1
typology 6 » typology _, typology 4.1
der tropen » den tropen, der treppen, der open
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: typology 6 variations 3 der tropen communication _ leur developpement de l'afrique.*.