Perhaps you should try some spelling variations:
developpement durable » developpement de
masks communication » mass communication, mass communications, markets communication
leur developpement » le developpement, deux developpements, de developpement
typologies 6.3 » typologies 2.3, typologie 1.3, typologies 2.5
6.3 variation » 3.3 variation, 6.4 variation, 1.3 variation
variation bei » variation des, variation der, variation _
cover masks » cover maps
bei cover » i cover, set cover, being covert

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

• Adding a wildcard symbol may retrieve word variants: typologies 6.3 variation bei cover masks communication a leur developpement durable afrique.*.