Perhaps you should try some spelling variations:
2.3.1.1 communication » 2.2.5.4 communication, 3.4.1 communication, 6.2.4.1 communication
le developpement » de developpement, sme development
developpement la » developpement de, developpement et, developpement du
technology than » technology tax, technology trap, technology change
than population » change population, orphan population, urban population
population age » population change, population aging, population data
fig 2.3.1.1 » fig 2.3.1.2, fig 2.3.1.3, fig 2.3.1.4
la fabrice » la fabrique, la matrice, la farce
costs le » costs _, costs 4, costs a
age fig » age fair, age five

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

• Adding a wildcard symbol may retrieve word variants: technology than population age fig 2.3.1.1 communication costs le developpement la fabrice.*.