Perhaps you should try some spelling variations:
oral communication » personal communication
does developpement » de developpement, des developpements, does development
developpement en » developpement et, developpement des, developpement de
topologien bei » topologie der, topologie des, topologie iii
variation oder » variation der, variation over, variation des
bei variation » de variation, der variation, based variation
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: topologien bei variation oder den oral communication _ does developpement en afrique.*.