Perhaps you should try some spelling variations:
transfer insulation » transfer innovation, transfer simulation, transfer simulations
insulation wages » insulation case, insulation layer, insulation e2
13 communication » 3 communication, 1 communication, 10 communication
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
wages race » wages trade, wage rate, wages case
race 13 » races 1.3, race 1.4, frage 13
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 wages race 13 communication costs 4 developpement en afrique.*.