Perhaps you should try some spelling variations:
optics communication » optic communication, optical communication, optical communications
gap developpement » au developpement, de developpement, le developpement
information pt » information part, information 1, information 1.2
systems gap » systems gaps, systems gdp, systems get
des africa » does africa, yes africa, de africa
11 optics » 1.1 optics, 10 optics, 13 optics
pt 11 » pt 1, pt 10, pt 12

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

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