Perhaps you should try some spelling variations:
1973 communication » 13 communication, 1.3 communication, 19 communication
technology change » technological change, technological changes
change inflation » change information, change innovation, change simulation
inflation rates » inflation rate
4 developpement » de developpement, le developpement, et developpement
des afrique » en afrique, de l'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 change inflation rates have 1973 communication costs 4 developpement des afrique.*.