Perhaps you should try some spelling variations:
optic communication » optical communications, public communication, device communication
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 des » a der, a das
a de » a die, a der, _ de

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "apologien der variation _ der optic communication ((a de) OR (a des)) developpement des afrique.~".
• Adding a wildcard symbol may retrieve word variants: apologien der variation _ der optic communication ((a de) OR (a des)) developpement des afrique.*.