Perhaps you should try some spelling variations:
opec communication » open communication, optic communication, ec communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
variation des » variation _, variation 6, variation series
dem opec » der opec, des opec, die opec
des dem » das dem, des der, des des
a de » a die, a der, a des

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

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