Perhaps you should try some spelling variations:
oral communication » personal communication
does developpement » de developpement, des developpements, does development
developpement et » developpement des, developpement de, development east
variation oder » variation der, variation over, variation des
topologie de » topologie der, topologie des, typologie des
de variation » der variation, die variation, does variation
et afrique » en afrique, l afrique
oder den » oder der, wider den, uber den
den oral » den ort, new oral

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

• Adding a wildcard symbol may retrieve word variants: topologie de variation oder den oral communication _ does developpement et afrique.*.