Perhaps you should try some spelling variations:
technology change » technological change, technological changes
change population » chinese population, age population, large population
population states » population status, population estimates, population strategy
2.3 communication » 3.2 communication, de communication, 4 communication
au developpement » du developpement, de developpement, le developpement
states trade » states state, states three
des afrique » en afrique, de l'afrique
trade 2.3 » trade 2.2, trade 2.1, trade 1.3

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

• Adding a wildcard symbol may retrieve word variants: technology change population states trade 2.3 communication _ au developpement des afrique.*.