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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie des variation des a oral communication ((a de) OR (a des)) developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie des variation des a oral communication ((a de) OR (a des)) developpement et afrique.*.