Perhaps you should try some spelling variations:
1973 communication » 13 communication, 1.3 communication, 19 communication
technology change » technological change, technological changes
change innovation » change information, chain innovation, trade innovation
innovation rates » innovation rate, innovation notes, innovation race
de developpement » sme development
developpement du » developpement de, developpement des, developpement et
du afrique » en afrique, l afrique, de l'afrique
rates can » rate can, rates cape, rates hans
can 1973 » van 1973, dan 1973, cara 1973
costs de » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technology change innovation rates can 1973 communication costs de developpement du afrique.*.