Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
development citizen » development caribbean
integration 3.4.2 » integration 2.4.2, integration 3.1.2, integration 3.4.1
trade development » software development
do communication » do communications, de communication, ngo communication
technologies 4 » technologies _
4 integration » 3 integration, 2 integration, 4.1 integration
costly trade » costs trade, country trade, costly than
3.4.2 does » 13.2.2 does, 3.4.2 die, 3.4.2 der
does do » does de, does d, does fdi

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 integration 3.4.2 does do communication costly trade development citizen _.*.