Perhaps you should try some spelling variations:
general population » rural population, general education
debt communication » de communication, et communication, get communication
developpement en » developpement et, developpement des, developpement de
population wage » population age, population wide, population aged
a developpement » au developpement, de developpement, le developpement
wage rate » wage rates
rate debt » private debt
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: methods general population wage rate debt communication costs a developpement en afrique.*.