Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
communication 4 » communication _, communication a, communication 3
developpement l » developpement il, developpement la, developpement de
l afrique » en afrique
4 does » 2 does
6 der » _ der, 2 der, 3 der
6 dr » 16 dr, _ dr, 6 de

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 ((6 dr) OR (6 der)) opec communication 4 does developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology _ variation ((6 dr) OR (6 der)) opec communication 4 does developpement l afrique.*.