Perhaps you should try some spelling variations:
population censuses » population census, population densities
4.9 communication » 4.1 communication, 4 communication, 2.3 communication
censuses prices » consumer prices
4 developing » 3 developing
developing a » developing _
prices 4.9 » prices 4.2, prices 4.6, prices 2.4
a african » _ african, 1 african, 2 african
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 _ population censuses prices 4.9 communication costs 4 developing a african.*.