Perhaps you should try some spelling variations:
recommendation system » recommendation systems, recommender system
leur developpement » le developpement, deux developpements, de developpement
6 recommendation » 6 recommendations, _ recommendation, 4 recommendations
information 3 » information 2
technology 1 » technology _
system leur » system leap, system lens, system lfr
des afrique » en afrique, de l'afrique
3 area » 1 area, 1.3 area, 3.1 area
area 6 » area _, area 5, area a

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

• Adding a wildcard symbol may retrieve word variants: technology 1 information 3 area 6 recommendation system leur developpement des afrique.*.