Perhaps you should try some spelling variations:
developpement du » developpement de, developpement des, developpement et
solution system » resolution system, solutions systems, isolation system
system problems » systemic problems, systems problem, systemic problem
2 communication » 3 communication, 4 communication, 1 communication
based solution » based solutions, based evaluation
problems 2 » problems _, problems 3, problems a
du afrique » en afrique, l afrique, de l'afrique

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

• Adding a wildcard symbol may retrieve word variants: technology based solution system problems 2 communication costs _ developpement du afrique.*.