Perhaps you should try some spelling variations:
personal communication » interpersonal communication
die developpement » de developpement, le developpement, du developpement
developpement en » developpement et, developpement des, developpement de
communication 2 » communication _, communication a, communication 3
rheologie die » theologie die, rheologie des, archaologie die
die variation » de variation, does variation, der variation
2.1 personal » 3.1 personal, 2.3 personal, 2.4 personal
variation 6 » variation _, variations _, variation des
6 2.1 » 66 2.1, b 2.1, _ 2.1

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

• Adding a wildcard symbol may retrieve word variants: rheologie die variation 6 2.1 personal communication 2 die developpement en afrique.*.