Perhaps you should try some spelling variations:
data communication » data communications
based formulation » basic formulation, case formulation, based simulation
formulation over » formation over, formulation model, formulation where
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
over evs » der evs, over 50s, over ep
evs data » cecs data, eels data, keys data

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

• Adding a wildcard symbol may retrieve word variants: technology based formulation over evs data communication _ de developpement en afrique.*.