Perhaps you should try some spelling variations:
oral communication » personal communication
der developpement » de developpement, des developpements, leur developpement
developpement en » developpement et, developpement des, developpement de
des variation » does variation, de variation, der variation
theorie des » theorie der
media der » media order, media under, mediale der

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

• Adding a wildcard symbol may retrieve word variants: theorie des variation _ hinves oral communication media der developpement en afrique.*.