Perhaps you should try some spelling variations:
developpement durable » developpement de
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
technology work » technology week, technology network, technology working
work population » worker population, world population, working population
1 developpement » de developpement, le developpement, et developpement
population age » population change, population aging, population data
age rate » wage rate, ae rate, age race
rate 6.2 » rates 6.2, rate 4.2, rate 5.2
costs 1 » 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 work population age rate 6.2 communication costs 1 developpement durable afrique.*.