Perhaps you should try some spelling variations:
oral communication » personal communication
developpements en » developpement en, developpement et, developpements de
des variation » does variation, de variation, der variation
variation des » variation _, variation 6, variation series
a oral » _ oral, 2 oral, 4 oral
des a » des ag, des _, des 3
a des » a das
a der » _ der, 2 der, 3 der
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 des) OR (a der)) developpements en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie des variation des a oral communication ((a des) OR (a der)) developpements en afrique.*.