Perhaps you should try some spelling variations:
oral communication » personal communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
variation bei » variation des, variation der, variation _
apologien de » apologien der, apologia de, apologie des
de variation » der variation, die variation, does variation
vs oral » u.s oral
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: apologien de variation bei vs oral communication a de developpement en afrique.*.