Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
developpement l » developpement il, developpement la, developpement de
l afrique » en afrique
des der » des ddr, des dem, des des
a does » 2 does, 4 does, 1 does

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typology _ variation ((des der) OR (des dr)) opec communication a does developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology _ variation ((des der) OR (des dr)) opec communication a does developpement l afrique.*.