Perhaps you should try some spelling variations:
guinea communications » business communications, online communications, data communications
developpement et » developpement des, developpement de, development east
des variation » does variation, de variation, der variation
et afrique » en afrique, l afrique
a des » a der, a das
a de » a die, a der, _ de
typologie » typologies, typology

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

• If you are trying to use Boolean operators, they must be ALL CAPS: typologie des variation _ from guinea communications ((a de) OR (a des)) developpement et afrique.~.
• Adding a wildcard symbol may retrieve word variants: typologie des variation _ from guinea communications ((a de) or (a des)) developpement et afrique.*.