Perhaps you should try some spelling variations:
developpement de » developpement des, developpement durable
apologien die » apologien der, apologia de, apologie des
die variation » de variation, does variation, der variation
variation a » variation _, variation 6, variation 5
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 die variation a d _ communication ((a de) OR (a des)) developpement de l'afrique.~".
• Adding a wildcard symbol may retrieve word variants: apologien die variation a d _ communication ((a de) OR (a des)) developpement de l'afrique.*.