Perhaps you should try some spelling variations:
2.3.1.5 communication » 2.3.1.1 communication, 13.4.5 communication, 2.2.5.4 communication
developpement en » developpement et, developpement des, developpement de
technology trap » technology trade, technology tax, technology than
trap population » rural population, rapid population, boar population
a developpement » au developpement, de developpement, le developpement
population per » population panel, population p230, population area
fig 2.3.1.5 » fig 2.3.1.2, fig 2.3.1.3, fig 2.3.1.4
per fig » per firm
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 trap population per fig 2.3.1.5 communication costs a developpement en france.*.