Perhaps you should try some spelling variations:
personal communication » interpersonal communication
communication 13 » communication 1.3, communication 3, communication 1
test development » forest development, port development, mena development
typologie based » typology based, ontologies based
based variation » based validation, based valuation, based vaccination
development de » development d, development ds, developpement de
variation der » variation des, variation bei, variation _
den personal » der personal, de personal, des personal
de afrique » de l'afrique, en afrique, l afrique
der den » oder den, der de, der der
13 test » 13 tests, 3 test, 1 test

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: typologie based variation der den personal communication 13 test development de afrique.*.