Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
au developpement » du developpement, de developpement, le developpement
developpement de » developpement des, developpement durable
die integrating » time integrating, die integration, die integrative
technology die » technologie die, technology does, technology 4ir
integrating i » integrating _, integrating a, integrating r
3.3 optical » 3.3 optimal, 3.3 political, 3.3 critical
de afrique » de l'afrique, en afrique, l afrique
model au » modele au, model a, model aa
i 3.3 » ii 3.3, a 3.3, i 3.1

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

• Adding a wildcard symbol may retrieve word variants: technology die integrating i 3.3 optical communication model au developpement de afrique.*.