Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
de developpement » sme development
developpement de » developpement des, developpement durable
4.2 integration » 2.2 integration, 3.2 integration, 5.2 integration
technology 4.2 » technology 2.2, technology 3.2, technology 4.1
de afrique » de l'afrique, en afrique, l afrique
media de » media die, media der, media diet

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

• Adding a wildcard symbol may retrieve word variants: technology 4.2 integration 3 _ optical communication media de developpement de afrique.*.