Perhaps you should try some spelling variations:
oral communication » personal communication
ontologies based » ontology based, colonies based, ontologies a
de developpement » sme development
based variation » based validation, based valuation, based vaccination
variation oder » variation der, variation over, variation des
des afrique » en afrique, de l'afrique
oder der » oder die
der oral » der moral, der ort, der orte
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: ontologies based variation oder der oral communication a de developpement des afrique.*.