Perhaps you should try some spelling variations:
actors communication » actions communication, active communication, networks communication
information centers » information contents, information officers
communication 22.1 » communication 2.1, communications 2.2.1, communication 8.2.1
technologies a » technologies _, technologies 4, technologies 2
a information » 2 information, 1 information
20 developing » 2 developing, 10 developing, 24 developing
developing a » developing _
centers 2.1 » center 2.1, centers 2.2, centers 2.8
2.1 actors » 2.1 factors, 2.2 actors, 4.1 actors
a afrique » l afrique, en afrique

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

• Adding a wildcard symbol may retrieve word variants: technologies a information centers 2.1 actors communication 22.1 20 developing a afrique.*.