Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
de developpement » sme development
technology cost » technology case, technology can, technology choice
cost integrated » cae integrated, debt integrated, more integrated
integrated land » integrated plan, integrated flood, integrated care
developpement l » developpement il, developpement la, developpement de
4 optical » 14 optical, _ optical, 4 optimal
l afrique » en afrique
model de » model due, model d, model du
land 4 » land _, land a, land 2

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

• Adding a wildcard symbol may retrieve word variants: technology cost integrated land 4 optical communication model de developpement l afrique.*.