Perhaps you should try some spelling variations:
technologies based » technologies used, technology based, technologies a
based formulation » basic formulation, case formulation, based simulation
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
formulation 3 » formulation _, formulations _, formulating _
de afrique » de l'afrique, en afrique, l afrique
3 doing » _ doing, 5 doing
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 3 doing _ communication costs 4 developpement de afrique.*.