Perhaps you should try some spelling variations:
does developpement » de developpement, des developpements, does development
communication 4 » communication _, communication a, communication 3
developpement l » developpement il, developpement la, developpement de
variation 6 » variation _, variations _, variation des
l afrique » en afrique
des opec » der opec, des opnv
dr opec » der opec, der oper, der open
4 does » 2 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 6 ((dr opec) OR (des opec)) communication 4 does developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology _ variation 6 ((dr opec) OR (des opec)) communication 4 does developpement l afrique.*.