Perhaps you should try some spelling variations:
developpement de » developpement des, developpement durable
variation und » variation _, variablen und, variation 6
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
de afrique » de l'afrique, en afrique, l afrique
und days » und das, und dank, und daf
3 du » 3 due, 3 d, 3 de
3 zu » 3 zur, 3 zum, 2 zu

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: "typology de variation und days _ communications ((3 du) OR (3 zu)) developpement de afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology de variation und days _ communications ((3 du) OR (3 zu)) developpement de afrique.*.