Perhaps you should try some spelling variations:
zu developpement » du developpement, au developpement, ou developpement
innovation case » innovation based, innovation chapter, innovation center
communication 2 » communication _, communication a, communication 3
developpement l » developpement il, developpement la, developpement de
l afrique » en afrique
4.1 et » 4.1 el, 4.1 ex
4.1 en » 4.1 ein, 4.1 el, 3.1 en
2 zu » 2 zur, 2 zum

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: "technologies _ innovation case ((4.1 et) OR (4.1 en)) communication 2 zu developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: technologies _ innovation case ((4.1 et) OR (4.1 en)) communication 2 zu developpement l afrique.*.