Perhaps you should try some spelling variations:
population centers » population center, population census, population censuses
5.2 communication » 3.2 communication, 6.2 communication, 2.2 communication
developing east » development east, developing a, developing asia
centers prices » center prcec, computers prices
1.4 developing » 12.4 developing, 1.3 developing, 14 developing
technology 1 » technology _
1 population » 2 population, 4 population, 2.1 population
east african » east africa, west african, west africa
prices 5.2 » prices 3.2, prices 4.2, prices 8.2
costs 1.4 » costs 11.4, costs 12.4, costs 4.4

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

• Adding a wildcard symbol may retrieve word variants: technology 1 population centers prices 5.2 communication costs 1.4 developing east african.*.