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
la afrique » l afrique, la fabrique, en afrique
des dem » des der, des des, des deux
das dem » das der, das den, das drei
a does » 2 does, 4 does, 1 does

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

• If you are trying to use Boolean operators, they must be ALL CAPS: typology _ variation ((des dem) OR (das dem)) opec communication a does developpement la afrique.~.
• Adding a wildcard symbol may retrieve word variants: typology _ variation ((des dem) or (das dem)) opec communication a does developpement la afrique.*.