Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
development works » development work, development workshop, development network
information case » information based, information can, information costs
1.13 optical » 3.3 optical, 3.11 optical, 4.3 optical
works africa » towns africa
case 1.13 » case 6.13, case 1.4.3, case 3.1.3
media 2 » media _, media 1, media 3

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information case 1.13 optical communication media 2 development works africa.*.