Perhaps you should try some spelling variations:
personal communication » interpersonal communication
ontologies based » ontology based, colonies based, ontologies a
communication 10 » communication 1, communication _, communication a
de developpement » sme development
developpement de » developpement des, developpement durable
based variation » based validation, based valuation, based vaccination
der personal » der personalen, der personen, der person
variation 6 » variation _, variations _, variation des
de afrique » de l'afrique, en afrique, l afrique
6 der » _ der, 2 der, 3 der
10 de » 10 die, 10 der, 10 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 6 der personal communication 10 de developpement de afrique.*.