Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
des afrique » en afrique, de l'afrique
ddr opec » der opec, der oper, des opec
des ddr » der ddr, des dr, dem ddr

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

• Adding a wildcard symbol may retrieve word variants: apologien der variation des ddr opec communication _ does developpement des afrique.*.