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 de » developpement des, developpement durable
innovation rate » innovation race, innovation create, innovation state
de afrique » de l'afrique, en afrique, l afrique
rate date » rate data, trade date, rate water
date 3.2 » daten 3.2, date 4.2, date 6.2

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 date 3.2 communication costs _ developpement de afrique.*.