Perhaps you should try some spelling variations:
oral communication » personal communication
ontologies based » ontology based, colonies based, ontologies a
de developpement » sme development
developpement de » developpement des, developpement durable
based variation » based validation, based valuation, based vaccination
communication 1 » communication _, communication a, communication 3
variation oder » variation der, variation over, variation des
de afrique » de l'afrique, en afrique, l afrique
oder den » oder der, wider den, uber den
den oral » den ort, new oral
1 de » 1 die, 1 der, _ de

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 den oral communication 1 de developpement de afrique.*.