Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
tests information » costs information, gets information, testing information
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
technology tests » technology thesis, technology best, technology costs
information fair » information unfair, information fake, information failure
than development » chain development, town development, plan development
development l » development li, development 1, development law
costly than » costly trade
trade 4.1 » trade 2.2, trade 3.2
l afrique » en afrique

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

• Adding a wildcard symbol may retrieve word variants: technology tests information fair trade 4.1 communication costly than development l afrique.*.