Perhaps you should try some spelling variations:
communication services » telecommunications services
optics communication » optic communication, optical communication, optical communications
chap developpement » au developpement, chad development, char development
technologies 1 » technologies _, technologies 4, technologies 2
information 1 » information 2, information 3, information 3.2
services chap » service chap, services can, services chapter
des africa » does africa, yes africa, de africa
11 optics » 1.1 optics, 10 optics, 13 optics
1 11 » 10 11, 1 1, 9 11

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

• Adding a wildcard symbol may retrieve word variants: technologies 1 information 1 11 optics communication services chap developpement des africa.*.