Perhaps you should try some spelling variations:
population census » population density, population densities
3.2 communication » 3 communication, 2.3 communication, de communication
technology dlt » technology data, technology debts, technology 21st
dlt population » adult population, de population, do population
developing a » developing _
prices 3.2 » price 3.2, prices 3.1, prices 4.2
a afrique » l afrique, en afrique

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

• Adding a wildcard symbol may retrieve word variants: technology dlt population census prices 3.2 communication costs _ developing a afrique.*.