Perhaps you should try some spelling variations:
oral communication » personal communication
du developpement » de developpement, le developpement, et developpement
developpement et » developpement des, developpement de, development east
ideologie der » ideologie und, typologie der
der variation » de variation, does variation, die variation
et afrique » en afrique, l afrique
6 first » 2 first, 1 first, 4 first
3 first » 2 first, 3.1 first

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ideologie der variation ((6 first) OR (3 first)) oral communication _ du developpement et afrique.~.
• Adding a wildcard symbol may retrieve word variants: ideologie der variation ((6 first) or (3 first)) oral communication _ du developpement et afrique.*.