Perhaps you should try some spelling variations:
communications series » communication series, communications services, communication services
rural communications » oral communication, rural telecommunications, cultural communications
de developpement » sme development
developpement de » developpement des, developpement durable
variation der » variation des, variation bei, variation _
series de » series d, series e, series new
do rural » two rural, 2 rural, 4 rural
der do » der de, der db, der does

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

• Adding a wildcard symbol may retrieve word variants: typologies _ variation der do rural communications series de developpement de l'afrique.*.