Perhaps you should try some spelling variations:
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
des variation » does variation, de variation, der variation
variation der » variation des, variation bei, variation _
den oral » den ort, new oral
der den » oder den, der de, der der
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 der den oral communication ((a des) OR (a der)) developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie des variation der den oral communication ((a des) OR (a der)) developpement en afrique.*.