Perhaps you should try some spelling variations:
oral communication » personal communication
variation series » education series, action series, edition series
de developpement » sme development
developpement et » developpement des, developpement de, development east
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
series dem » series de, series nejm, series d
et afrique » en afrique, l afrique
dem oral » dem gral, dem ort
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: typologie de variation series dem oral communication a de developpement et afrique.*.