Perhaps you should try some spelling variations:
oral communication » personal communication
developpement de » developpement des, developpement durable
des variation » does variation, de variation, der variation
variation des » variation _, variation 6, variation series
de afrique » de l'afrique, en afrique, l afrique
a oral » _ oral, 2 oral, 4 oral
des a » des ag, des _, des 3
a der » _ der, 2 der, 3 der
a de » a die, a des, _ de
typologie » typologies, typology

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 des variation des a oral communication ((a de) OR (a der)) developpement de afrique.~.
• Adding a wildcard symbol may retrieve word variants: typologie des variation des a oral communication ((a de) or (a der)) developpement de afrique.*.