Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
technology serie » technology series, technology service, technology sereis
serie innovation » series innovation, service innovation, services innovation
developpement en » developpement et, developpement des, developpement de
innovation node » innovation nodes, innovation code, innovation model
node date » node case
date 6.2 » daten 6.2, data 6.2, date 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology serie innovation node date 6.2 communication costs _ developpement en afrique.*.