Perhaps you should try some spelling variations:
4.2 developpement » 4.2 development, de developpement, le developpement
de communication » mobile communication, online communication
developpement en » developpement et, developpement des, developpement de
population wage » population age, population wide, population aged
methods rural » methods real, methods ruin
wage private » large private, stage private, were private
private de » private debt, private das, private _

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 4.2 developpement en afrique.*.