Perhaps you should try some spelling variations:
optic communication » optical communications, public communication, device communication
de developpement » sme development
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
des afrique » en afrique, de l'afrique
der optic » der option, der opec, der optes
a de » a die, a der, a des

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 optic communication a de developpement des afrique.*.