Perhaps you should try some spelling variations:
oral communication » personal communication
du developpement » de developpement, le developpement, et developpement
figures oral » figures draw, figures a, figures from
6 variation » 6 variations, _ variation, 2 variation
des afrique » en afrique, de l'afrique
typology 6 » typology _, typology 4.1
a du » a d, a de, a u

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

• Adding a wildcard symbol may retrieve word variants: typology 6 variation _ figures oral communication a du developpement des afrique.*.