Perhaps you should try some spelling variations:
trades developpement » trade developement, trades development, trade development
oral communication » personal communication
developpement en » developpement et, developpement des, developpement de
des variation » does variation, de variation, der variation
typology des » typologie des, typologie der, typology _
costs trades » costs trade, costly trade
variation 3 » variation _, variation 6, variation 5
der oral » der moral, der ort, der orte
3 der » _ der, 2 der

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

• Adding a wildcard symbol may retrieve word variants: typology des variation 3 der oral communication costs trades developpement en afrique.*.