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
a developpement » au developpement, de developpement, le developpement
population per » population panel, population p230, population area
per fig » per firm
costs a » costs _, costs 4
matrice. » matrices., maurice., patrice.

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 a developpement la matrice.*.