Perhaps you should try some spelling variations:
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
de developpement » sme development
population per » population panel, population p230, population area
technology 2 » technology _, technology 1, technology 3
des afrique » en afrique, de l'afrique
costs de » costs _, costs 4, costs a
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 2 population per fig 5.2 communication costs de developpement des afrique.*.