Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
oral communication » personal communication
trade development » software development
typologies des » typologie des, typologie der, typologien der
des variation » does variation, de variation, der variation
development l » development li, development 1, development law
costly trade » costs trade, country trade, costly than
variation 6 » variation _, variations _, variation des
l afrique » en afrique
der oral » der moral, der ort, der orte
6 der » _ der, 2 der, 3 der

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

• Adding a wildcard symbol may retrieve word variants: typologies des variation 6 der oral communication costly trade development l afrique.*.