Perhaps you should try some spelling variations:
technological chain » technological change, technological choice, technological gains
2.3 communication » 3.2 communication, de communication, 4 communication
chain innovation » chain integration, open innovation, green innovation
developpement de » developpement des, developpement durable
innovation rate » innovation race, innovation create, innovation state
4 developpement » de developpement, le developpement, et developpement
de afrique » de l'afrique, en afrique, l afrique
data 2.3 » data 2.2
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: technological chain innovation rate data 2.3 communication costs 4 developpement de afrique.*.