Perhaps you should try some spelling variations:
2.3.4 communication » 12.2.4 communication, 12.4.4 communication, 2.3 communication
du developpement » de developpement, le developpement, et developpement
technology farm » technology firm, technology firms, technology from
farm population » slum population, rural population
developpement l » developpement il, developpement la, developpement de
population age » population change, population aging, population data
prices 2.3.4 » prices 2.3.1, prices 2.3.5, prices 2.3.6
age prices » wages prices, base prices, gate prices
l afrique » en afrique
costs du » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technology farm population age prices 2.3.4 communication costs du developpement l afrique.*.