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
developpement de » developpement des, developpement durable
technology than » technology tax, technology trap, technology change
than population » change population, orphan population, urban population
population area » population age, population africa, population share
a developpement » au developpement, de developpement, le developpement
fig 2.3.1.1 » fig 2.3.1.2, fig 2.3.1.3, fig 2.3.1.4
de fabrice » die fabrics, avec fabrice, die fabriken
area fig » area cir
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 than population area fig 2.3.1.1 communication costs a developpement de fabrice.*.