Perhaps you should try some spelling variations:
optical communications » optic communication, political communication, digital communications
does developpement » de developpement, des developpements, does development
communications 2 » communications _, communications a, communications 5
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
der optical » der optimale, der optimalen, depth optical
des afrique » en afrique, de l'afrique
2 does » 4 does

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

• Adding a wildcard symbol may retrieve word variants: apologien der variation _ der optical communications 2 does developpement des afrique.*.