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
du developpement » de developpement, le developpement, et developpement
developpement de » developpement des, developpement durable
technologie die » technologie de, technologie im, technologie der
die integrating » time integrating, die integration, die integrative
de afrique » de l'afrique, en afrique, l afrique
model du » model due, model d, model dal

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

• Adding a wildcard symbol may retrieve word variants: technologie die integrating world _ optical communication model du developpement de afrique.*.