Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
des developpements » deux developpements, de developpement, et developpements
developpements en » developpement en, developpement et, developpements de
des variations » les variations, does variation, its variations
der opec » der oper, des opec, der opfer
a des » a der, a das
typologie » typologies, typology

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

• Adding a wildcard symbol may retrieve word variants: typologie des variations _ der opec communication a des developpements en afrique.*.