Perhaps you should try some spelling variations:
technological chain » technological change, technological choice, technological gains
3.2 communication » 3 communication, 2.3 communication, de communication
chain innovation » chain integration, open innovation, green innovation
developpement du » developpement de, developpement des, developpement et
innovation race » innovation rate, innovation space, innovation brac
du afrique » en afrique, l afrique, de l'afrique
race race » grace grace, space race, race place
race 3.2 » race 3.7, race 4.2, rice 3.2

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

• Adding a wildcard symbol may retrieve word variants: technological chain innovation race race 3.2 communication costs _ developpement du afrique.*.