Perhaps you should try some spelling variations:
6.2.4.1 communication » 6.2.4.2 communication, 6.2.4.3 communication, 11.4.1 communication
technology change » technological change, technological changes
change population » chinese population, age population, large population
developpement la » developpement de, developpement et, developpement du
population per » population panel, population p230, population area
la fabrice » la fabrique, la matrice, la farce
per fig » per firm

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

• Adding a wildcard symbol may retrieve word variants: technology change population per fig 6.2.4.1 communication costs _ developpement la fabrice.*.