Perhaps you should try some spelling variations:
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
de variation » der variation, die variation, does variation
apologie de » apologie des, apologia de, apologien der
variation 6 » variation _, variations _, variation des
know oral » new oral
6 know » _ know, i know, 2 know

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

• Adding a wildcard symbol may retrieve word variants: apologie de variation 6 know oral communication media _ developpement en afrique.*.