Perhaps you should try some spelling variations:
communication case » communications case, communication based, communication phase
technologies from » technology from, technologies co, technologies art
das developpement » des developpements, de developpement, du developpement
19 communication » 1 communication, 10 communication, 9 communication
developpement de » developpement des, developpement durable
informal 2.3.1 » informal 15.3.3, informal 3.4.5, information 2.3.1
de afrique » de l'afrique, en afrique, l afrique
2.3.1 des » 2.3.1 does, 2.3.1 der, 2.3.1 das
case das » case des, case case, case data

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

• Adding a wildcard symbol may retrieve word variants: technologies from informal 2.3.1 des 19 communication case das developpement de afrique.*.