Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
law developpement » le developpement, au developpement, leur developpement
developpement en » developpement et, developpement des, developpement de
die integrating » time integrating, die integration, die integrative
technology die » technologie die, technology does, technology 4ir
3.3 optical » 3.3 optimal, 3.3 political, 3.3 critical

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

• Adding a wildcard symbol may retrieve word variants: technology die integrating _ 3.3 optical communication model law developpement en afrique.*.