Perhaps you should try some spelling variations:
leur development » leur developpement, your development, spur development
4 communication » 3 communication, 5.4 communication, de communication
development eco » development second, development east, development menu
variation did » variation des, variation der, variation und
variation im » variation _, variation 6, variation des
eco afrique » en afrique

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: "typologies _ ((variation did) OR (variation im)) o 4 communication a leur development eco afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologies _ ((variation did) OR (variation im)) o 4 communication a leur development eco afrique.*.