Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
communication 13 » communication 1.3, communication 3, communication 1
does development » dams development, ides development, smes development
development de » development d, development ds, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
variation 5 » variation _, variation 6, variation a
does opec » des opec, does hope, does one
13 does » 10 does
5 does » 2 does, 4 does

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation 5 does opec communication 13 does development de l'afrique.*.