Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
oral communication » personal communication
development manuel » developpement manuel, development model, development master
trade development » software development
typologies der » typologie der, typologien der, typologie des
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
costly trade » costs trade, country trade, costly than
der oral » der moral, der ort, der orte
des der » des dr, des ddr, des dem

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

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