Perhaps you should try some spelling variations:
2.15 communication » 2.14 communication, 2.5 communication, 2.3 communication
thesis population » ties population, texas population, species population
developpement et » developpement des, developpement de, development east
4 developpement » de developpement, le developpement, et developpement
et afrique » en afrique, l afrique
fig 2.15 » fig 2.1, fig 2.35, fig 12.11
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 thesis population p230 fig 2.15 communication costs 4 developpement et afrique.*.