Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
integrating world » integrated world, integrating area, integrating land
le developpement » de developpement, sme development
developpement en » developpement et, developpement des, developpement de
die integrating » time integrating, die integration, die integrative
technology die » technologie die, technology does, technology 4ir
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 die integrating world _ optical communication model le developpement en afrique.*.