Perhaps you should try some spelling variations:
1973 communication » 13 communication, 1.3 communication, 19 communication
population rates » population debates, population related, population data
le developpement » de developpement, sme development
developpement en » developpement et, developpement des, developpement de
technology age » technology usage, technology wages, technology a
rates dan » rates data, rates hans, rates a
dan 1973 » van 1973, dan 1963, can 1973
costs le » 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 age population rates dan 1973 communication costs le developpement en afrique.*.