Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
4.2 communications » 4.2 communication, 3.2 communication, 6.2 communication
technology change » technological change, technological changes
change simulation » change simulations, channel simulation, change population
developpement la » developpement de, developpement et, developpement du
4 developpement » de developpement, le developpement, et developpement
based case » based care, base case, based phase
la afrique » l afrique, la fabrique, en afrique
case 4.2 » case 4.1, case 2
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology change simulation based case 4.2 communications costs 4 developpement la afrique.*.