Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
calculations phase » calculations charge, calculations based, calculations chapter
trade development » software development
development model » development models, development middle
de communication » mobile communication, online communication
technologies 2 » technologies _, technologies 4
2 calculations » _ calculations, 2 calculation, 1 calculations
costly trade » costs trade, country trade, costly than
phase 2 » phase 1, phase _
2 de » 2 die, 2 der, _ de

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 calculations phase 2 de communication costly trade development model afrique.*.