Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
technology trade » technology trends, technology transfer, technology transfers
integration work » integrating world, integration framework, integration 3
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
model de » model due, model d, model du

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

• Adding a wildcard symbol may retrieve word variants: technology trade integration work _ optical communication model de developpement en afrique.*.