Perhaps you should try some spelling variations:
oral communication » personal communication
de developpement » sme development
variation his » variation des, variation im, variation i
des afrique » en afrique, de l'afrique
first oral » first organ, first deal, first drupal
his first » hits first, aids first, rris first
a de » a die, a der, a des

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

• Adding a wildcard symbol may retrieve word variants: typology _ variation his first oral communication a de developpement des afrique.*.