Perhaps you should try some spelling variations:
recommendation system » recommendation systems, recommender system
labor recommendation » floor recommendation, a recommendation, award recommendation
du developpement » de developpement, le developpement, et developpement
developpement de » developpement des, developpement durable
information 8.5 » information 8.4, information 8.6, information 3.2
technology 1 » technology _
case labor » care labor, based labor, male labor
de afrique » de l'afrique, en afrique, l afrique
system du » system due, systeme du, system d
8.5 case » 5.5 case, 3.5 case, 4.5 case

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

• Adding a wildcard symbol may retrieve word variants: technology 1 information 8.5 case labor recommendation system du developpement de afrique.*.