Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
die developpement » de developpement, le developpement, du developpement
developpement de » developpement des, developpement durable
communication 4 » communication _, communication a, communication 3
variation des » variation _, variation 6, variation series
de afrique » de l'afrique, en afrique, l afrique
dr opec » der opec, der oper, des opec
4 die » 2 die, 3 die, _ die

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

• Adding a wildcard symbol may retrieve word variants: typology _ variation des dr opec communication 4 die developpement de afrique.*.