Perhaps you should try some spelling variations:
2.14 communication » 2.4 communication, 5.4 communication, 2.3 communication
technology trade » technology trends, technology transfer, technology transfers
trade population » create population, france population, age population
developpement et » developpement des, developpement de, development east
population area » population age, population africa, population share
4 developpement » de developpement, le developpement, et developpement
et fabrice » avec fabrice, roth fabrice
area fig » area cir
fig 2.14 » fig 2.1, fig 2.4, fig 2.15
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: technology trade population area fig 2.14 communication costs 4 developpement et fabrice.*.