Perhaps you should try some spelling variations:
de communication » mobile communication, online communication
developpement et » developpement des, developpement de, development east
population wage » population age, population wide, population aged
4 developpement » de developpement, le developpement, et developpement
methods rural » methods real, methods ruin
wage private » large private, stage private, were private
private de » private debt, private das, private _
et afrique » en afrique, l afrique
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: methods rural population wage private de communication costs 4 developpement et afrique.*.