Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
d'une communication » de communication, prone communication, true communication
trade development » software development
regulation model » regulation module, simulation model, population model
technologies 2 » technologies _, technologies 4
2 regulation » de regulation, co regulation, cap regulation
costly trade » costs trade, country trade, costly than
index africa » andes africa, india africa, index asia
model 2 » model 1, model 2.2, model 2.1
2 d'une » 1 d'une, et d'une

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 regulation model 2 d'une communication costly trade development index africa.*.