Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
als developpement » le developpement, au developpement, des developpements
information 1 » information 2, information 3, information 3.2
systems als » system als, systeme als, systems all
des africa » does africa, yes africa, de africa
1 optical » 12 optical, 14 optical, _ optical

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information 1 1 optical communication systems als developpement des africa.*.