Perhaps you should try some spelling variations:
optical communications » optic communication, political communication, digital communications
communications models » communication model, communication modes, communicating model
integration work » integrating world, integration framework, integration 3
developpement de » developpement des, developpement durable
technologie die » technologie de, technologie im, technologie der
die integration » trade integration
d developpement » de developpement, du developpement, le developpement
de afrique » de l'afrique, en afrique, l afrique
3 optical » _ optical, 3 optimal, 3.3 optical
models d » models 1, models 3, models 2

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

• Adding a wildcard symbol may retrieve word variants: technologie die integration work 3 optical communications models d developpement de afrique.*.