Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
developpement la » developpement de, developpement et, developpement du
variation des » variation _, variation 6, variation series
la afrique » l afrique, la fabrique, en afrique
dem opec » der opec, des opec, die opec
des dem » das dem, des der, des des
a does » 2 does, 4 does, 1 does

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

• Adding a wildcard symbol may retrieve word variants: typology _ variation des dem opec communication a does developpement la afrique.*.