Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
does developpement » de developpement, des developpements, does development
variation series » education series, action series, edition series
de variation » der variation, die variation, does variation
apologia de » tipologia de, apologie des, apologia _
des afrique » en afrique, de l'afrique
series der » serien der, series de, series d
der opec » der oper, des opec, der opfer
a does » 2 does, 4 does, 1 does

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

• Adding a wildcard symbol may retrieve word variants: apologia de variation series der opec communication a does developpement des afrique.*.