Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
developpement en » developpement et, developpement des, developpement de
communication 4 » communication _, communication a, communication 3
variation des » variation _, variation 6, variation series
ddr opec » der opec, der oper, des opec
des ddr » der ddr, des dr, dem ddr
4 does » 2 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 ddr opec communication 4 does developpement en afrique.*.