Perhaps you should try some spelling variations:
technological channel » technological change, technological changes, technological choice
channel simulation » change simulation, change simulations, channel modulation
2.3 communication » 3.2 communication, de communication, 4 communication
developpement de » developpement des, developpement durable
simulation als » simulation goals, simulation des, simulation a
de afrique » de l'afrique, en afrique, l afrique
als acd » als auch
acd 2.3 » a3d 2.3, ward 2.3

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

• Adding a wildcard symbol may retrieve word variants: technological channel simulation als acd 2.3 communication costs _ developpement de afrique.*.