Perhaps you should try some spelling variations:
populations plague » populations age, populations live, populations labor
study populations » study population, student populations, student population
developpement la » developpement de, developpement et, developpement du
4 communication » 3 communication, 5.4 communication, de communication
a developpement » au developpement, de developpement, le developpement
france 4 » france _, france a, france 3
costs a » costs _, costs 4
matrice. » matrices., maurice., patrice.

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

• Adding a wildcard symbol may retrieve word variants: technology study populations plague france 4 communication costs a developpement la matrice.*.