Perhaps you should try some spelling variations:
population censuses » population census, population densities
2.7 communication » 2.3 communication, 3.2 communication, 2 communication
censuses prices » consumer prices
technology dlt » technology data, technology debts, technology 21st
dlt population » adult population, de population, do population
a developing » a development
developing a » developing _
prices 2.7 » prices 2.4, prices 2.1, prices 2.3
a afrique » l afrique, en afrique
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 dlt population censuses prices 2.7 communication costs a developing a afrique.*.