Perhaps you should try some spelling variations:
change population » chinese population, age population, large population
population model » population models, population age, population based
developpement et » developpement des, developpement de, development east
2 communication » 3 communication, 4 communication, 1 communication
a developpement » au developpement, de developpement, le developpement
model case » model based, model code, model can
et afrique » en afrique, l afrique
costs a » costs _, costs 4
case 2 » case 1
technological » technologies

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

• Adding a wildcard symbol may retrieve word variants: technological change population model case 2 communication costs a developpement et afrique.*.