Perhaps you should try some spelling variations:
population census » population density, population densities
developpement du » developpement de, developpement des, developpement et
3 communication » 4 communication, de communication, data communication
a developpement » au developpement, de developpement, le developpement
technology 3 » technology _, technology 1, technology 4
3 population » 2 population, 4 population, 1 population
census price » cross price, census tract
du afrique » en afrique, l afrique, de l'afrique
price 3 » price _, price a, price 2.3
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: technology 3 population census price 3 communication costs a developpement du afrique.*.