Perhaps you should try some spelling variations:
formulation where » formulation over, formulation des, calculation where
based development » basin development, land development, rapid development
de communication » mobile communication, online communication
development main » development making, development moving, development mode
main afrique » en afrique
costs based » cost based, costs case, hots based
where dx » where do, where did, where _
dx de » d de, ix de, x de

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

• Adding a wildcard symbol may retrieve word variants: technologies _ formulation where dx de communication costs based development main afrique.*.