Perhaps you should try some spelling variations:
debt communication » de communication, et communication, get communication
developpement de » developpement des, developpement durable
innovation case » innovation based, innovation chapter, innovation center
de afrique » de l'afrique, en afrique, l afrique
case 5.1 » case 4.1, case 3.1, case 5.2
5.1 debt » 5.1 det, 5.1 der, 2.5 debt
a le » a les, a l, a e

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ innovation case 5.1 debt communication ((a le) OR (a la)) developpement de afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "technologies _ innovation case 5.1 debt communication ((a le) OR (a la)) developpement de afrique.*".