Perhaps you should try some spelling variations:
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die 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

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