Perhaps you should try some spelling variations:
population censuses » population census, population densities
2.4 communication » 2.14 communication, 5.4 communication, 2.3 communication
censuses prices » consumer prices
developing east » development east, developing a, developing asia
technology 2.2 » technology _, technology 1, technology 3
2.2 population » 2.1 population
4 developing » 3 developing
east afrique » east africa, east african, en afrique
prices 2.4 » prices 4, practices 2.4, services 2.4
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 2.2 population censuses prices 2.4 communication costs 4 developing east afrique.*.