Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
4.4 communications » 5.4 communication, 1.4 communication, 14 communications
technology change » technological change, technological changes
change simulation » change simulations, channel simulation, change population
simulation und » simulation using, simulation _, simulation 4
developing li » developing ai, developing l2, developing cil
4 developing » 3 developing
li afrique » l afrique, en afrique
und case » und care, und cash, id case
case 4.4 » case 4.1, case 4.2, case 2.3
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 und case 4.4 communications costs 4 developing li afrique.*.