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 ds » development d, development does, development desd
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
ds l'afrique » de l'afrique, de l'amerique
13 does » 10 does
5 does » 2 does
4 does » 2 does

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie de variation ((5 does) OR (4 does)) opec communication 13 does development ds l'afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie de variation ((5 does) OR (4 does)) opec communication 13 does development ds l'afrique.*.