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 developing » 3 developing
developing l » developing l2, developing _, developing a
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 developing l afrique.*.