Perhaps you should try some spelling variations:
oral communication » personal communication
dam developpement » de developpement, du developpement, au developpement
developpement en » developpement et, developpement des, developpement de
communication 1 » communication _, communication a, communication 3
des variation » does variation, de variation, der variation
typology des » typologie des, typologie der, typology _
6 first » 2 first, 1 first, 4 first
3 first » 2 first, 3.1 first
1 dam » 1 das, _ dam, a dam

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typology des variation ((6 first) OR (3 first)) oral communication 1 dam developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology des variation ((6 first) OR (3 first)) oral communication 1 dam developpement en afrique.*.