Perhaps you should try some spelling variations:
developpement de » developpement des, developpement durable
3 communication » 4 communication, de communication, data communication
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
variation 5 » variation _, variation 6, variation a
de afrique » de l'afrique, en afrique, l afrique
5 der » _ der, 2 der, 3 der
der 3 » der _, der e, des 3
a der » _ der, 2 der, 3 der
a de » a die, a des, _ de

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

• If you are trying to use Boolean operators, they must be ALL CAPS: typologie de variation 5 der 3 communication ((a de) OR (a der)) developpement de afrique.~.
• Adding a wildcard symbol may retrieve word variants: typologie de variation 5 der 3 communication ((a de) or (a der)) developpement de afrique.*.