Perhaps you should try some spelling variations:
oper communication » open communication, proper communication, power communication
does developpement » de developpement, des developpements, does development
developpement en » developpement et, developpement des, developpement de
des variation » does variation, de variation, der variation
variation des » variation _, variation 6, variation series
ddr oper » der oper, ddr der, der opec
des ddr » der ddr, des dr, dem ddr
typologie » typologies, typology

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

• Adding a wildcard symbol may retrieve word variants: typologie des variation des ddr oper communication _ does developpement en afrique.*.