Perhaps you should try some spelling variations:
technology transfers » technology transfer
communications costs » communication costs, communications _
des developpement » des developpements, de developpement, le developpement
transfers sector » transport sector, transfer factor, transfers better
developpement en » developpement et, developpement des, developpement de
sector wage » sector wages
wage rate » wage rates
costs des » costs fees

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

• Adding a wildcard symbol may retrieve word variants: technology transfers sector wage rate _ communications costs des developpement en afrique.*.