Perhaps you should try some spelling variations:
developpement durable » developpement de
technology change » technological change, technological changes
change population » chinese population, age population, large population
4.2 communication » 4.2 communications, 3.2 communication, 4.1 communication
a developpement » au developpement, de developpement, le developpement
population a » population _, population 1, population 3
case 4.2 » case 4.1, case 2
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 change population a case 4.2 communication costs a developpement durable afrique.*.