Perhaps you should try some spelling variations:
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
technology area » technology arena, technology array, technology age
area population » a population, farm population, la population
a developpement » au developpement, de developpement, le developpement
population per » population panel, population p230, population area
des afrique » en afrique, de l'afrique
per fig » per firm
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology area population per fig 5.2 communication costs a developpement des afrique.*.