Perhaps you should try some spelling variations:
population issues » population pressures, population census
3.2 communication » 3 communication, 2.3 communication, de communication
4 developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
issues france » issue france, issues faced, values france
technology 1 » technology _
1 population » 2 population, 4 population, 2.1 population
france 3.2 » france 2.2, france 3.3, france 4.2
l afrique » en afrique
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology 1 population issues france 3.2 communication costs 4 developpement l afrique.*.