Perhaps you should try some spelling variations:
cover developpement » power development, de developpement, le developpement
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
variation der » variation des, variation bei, variation _
media cover » media over, media love, media coverage
does oral » does formal, does oil

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

• Adding a wildcard symbol may retrieve word variants: typology _ variation der does oral communication media cover developpement en afrique.*.