Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
le developpement » de developpement, sme development
developpement en » developpement et, developpement des, developpement de
technology cost » technology case, technology can, technology choice
cost integrated » cae integrated, debt integrated, more integrated
integrated land » integrated plan, integrated flood, integrated care
model le » model led, model law, model 1

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 _ optical communication model le developpement en afrique.*.