Perhaps you should try some spelling variations:
technological changes » technological change, technological advances
changes population » change population, changing population, china's population
13.3 communication » 1.3 communication, 3.3 communication, 13.3.9 communication
developpement il » developpement de, developpement et, developpement du
4 developpement » de developpement, le developpement, et developpement
il afrique » l afrique, en afrique
care 13.3 » care 1.3, care 13.6, care 14.3
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: technological changes population _ care 13.3 communication costs 4 developpement il afrique.*.