Perhaps you should try some spelling variations:
der communication » de communication, under communication, debt communication
innovation case » innovation based, innovation chapter, innovation center
1 afrique » l afrique, en afrique, 1 enrique
case 4.1 » case 4.2, case 1
4.1 der » 2.1 der, 3.1 der, 1.1 der
3 same » _ same, 3 safe, 3 sama
3 sme » _ sme, 3 smt, 5 sme

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 der communication ((3 sme) OR (3 same)) development 1 afrique.~".
• Adding a wildcard symbol may retrieve word variants: technologies _ innovation case 4.1 der communication ((3 sme) OR (3 same)) development 1 afrique.*.