Perhaps you should try some spelling variations:
population sector » population structure
4.2 communication » 4.2 communications, 3.2 communication, 4.1 communication
technology dlt » technology data, technology debts, technology 21st
dlt population » adult population, de population, do population
sector prices » factor prices, sector policies, sector services
4 developing » 3 developing
developing a » developing _
prices 4.2 » prices 3.2, prices 4.6, prices 4.9
a afrique » l afrique, en afrique
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 dlt population sector prices 4.2 communication costs 4 developing a afrique.*.