Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
integrated world » integrating world, integrated child, integrated water
de developpement » sme development
technology 1 » technology _
des afrique » en afrique, de l'afrique
2 optical » 12 optical, 20 optical, _ optical
model de » model due, model d, model du
world 2 » world _, world a, world 1

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

• Adding a wildcard symbol may retrieve word variants: technology 1 integrated world 2 optical communication model de developpement des afrique.*.