Perhaps you should try some spelling variations:
optics communication » optic communication, optical communication, optical communications
gap developpement » au developpement, de developpement, le developpement
developpement de » developpement des, developpement durable
information 1.2 » information 1.5.2, information 2
systems gap » systems gaps, systems gdp, systems get
11 optics » 1.1 optics, 10 optics, 13 optics
de africa » does africa, de america, use africa

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information 1.2 11 optics communication systems gap developpement de africa.*.