Perhaps you should try some spelling variations:
population sector » population structure
technology world » technology work, technological world, technology working
de communication » mobile communication, online communication
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
sector prices » factor prices, sector policies, sector services
prices de » prices does, prices _, prices a
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 world population sector prices de communication costs 4 developpement en afrique.*.