Perhaps you should try some spelling variations:
oral communication » personal communication
de developpement » sme development
developpement de » developpement des, developpement durable
information 5.2 » information 15.2, information 1.2, information 5.4
technologies a » technologies _, technologies 4, technologies 2
a information » 2 information, 1 information
de afrique » de l'afrique, en afrique, l afrique
do oral » do rural, who oral

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

• Adding a wildcard symbol may retrieve word variants: technologies a information 5.2 do oral communication _ de developpement de afrique.*.