Perhaps you should try some spelling variations:
2.30 communication » 2.3 communication, 2.7 communication, 1.3 communication
thesis population » ties population, texas population, species population
population per » population panel, population p230, population area
development la » development law, development li, development land
4 development » 2 development, 4 developing
fig 2.30 » fig 2.3, fig 2.35, fig 2.39
per fig » per firm
costs 4 » costs _, costs a, costs 4.2
fabrique. » afrique., fabrice.

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

• Adding a wildcard symbol may retrieve word variants: technology thesis population per fig 2.30 communication costs 4 development la fabrique.*.