Perhaps you should try some spelling variations:
oral communication » personal communication
du developpement » de developpement, le developpement, et developpement
variation behn » variation bei, variation des, variation der
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
des afrique » en afrique, de l'afrique
behn does » being does, ban does
does oral » does formal, does oil
a du » a d, a de, a u

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

• Adding a wildcard symbol may retrieve word variants: apologien der variation behn does oral communication a du developpement des afrique.*.