Perhaps you should try some spelling variations:
developpement durable » developpement de
communication costly » communication costs, communication costa, communications costs
trade developpement » trade developement, trade development, de developpement
put communication » post communication, et communication, get communication
typologies de » typologien der, typologies _, typologie des
de variation » der variation, die variation, does variation
costly trade » costs trade, country trade, costly than
variation a » variation _, variation 6, variation 5
der put » der input, der punkt, bear put
a 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 de variation a der put communication costly trade developpement durable afrique.*.