Perhaps you should try some spelling variations:
2.3.1.2 communication » 2.3.1.1 communication, 2.2.5.4 communication, 3.2.3.2 communication
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
technology tax » technology than, technology trap, technology tpm
tax population » farm population, fast population, boar population
population per » population panel, population p230, population area
fig 2.3.1.2 » fig 2.3.1.3, fig 2.3.1.4, fig 2.3.1.5
de fabrice » die fabrics, avec fabrice, die fabriken
per fig » per firm
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 tax population per fig 2.3.1.2 communication costs 4 developpement de fabrice.*.