Perhaps you should try some spelling variations:
oral communication » personal communication
developpements en » developpement en, developpement et, developpements de
variation behn » variation bei, variation des, variation der
de variation » der variation, die variation, does variation
apologie de » apologie des, apologia de, apologien der
behn does » being does, ban does
does oral » does formal, does oil
a bet » a best, a bent, a beta
a et » a set, a net, a jet

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "apologie de variation behn does oral communication ((a et) OR (a bet)) developpements en afrique.~".
• Adding a wildcard symbol may retrieve word variants: apologie de variation behn does oral communication ((a et) OR (a bet)) developpements en afrique.*.