Perhaps you should try some spelling variations:
technologies based » technologies used, technology based, technologies a
based formulation » basic formulation, case formulation, based simulation
de communication » mobile communication, online communication
formulation des » formation des, formulacion de, formulation _
4 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
des using » es using, codes using, deals using
l afrique » en afrique
using de » using dea, using dem, using due
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies based formulation des using de communication costs 4 developpement l afrique.*.