Perhaps you should try some spelling variations:
technological changes » technological change, technological advances
changes simulation » change simulation, change simulations, channel simulation
5.4 communication » de communication, data communication
au developpement » du developpement, de developpement, le developpement
developpement l » developpement il, developpement la, developpement de
l afrique » en afrique
care 5.4 » care 5.3, care 5.1, care 2.4
costs au » costs a, costs amy, costs _

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

• Adding a wildcard symbol may retrieve word variants: technological changes simulation _ care 5.4 communication costs au developpement l afrique.*.