Perhaps you should try some spelling variations:
recommendation system » recommendation systems, recommender system
leap developpement » le developpement, leur developpement, de developpement
6 recommendation » 6 recommendations, _ recommendation, 4 recommendations
developpement de » developpement des, developpement durable
information 3 » information 2
technology 1 » technology _
system leap » system clear, system legal, system law
de afrique » de l'afrique, en afrique, 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 leap developpement de afrique.*.