Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
transfer insulation » transfer innovation, transfer simulation, transfer simulations
insulation wage » insulation case, insulation layer, insulation glass
4 development » 2 development, 4 developing
development l » development li, development 1, development law
wage rate » wage rates
l afrique » en afrique
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 transfer insulation wage rate data communications costs 4 development l afrique.*.