Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
information case » information based, information can, information costs
developpement en » developpement et, developpement des, developpement de
4 developpement » de developpement, le developpement, et developpement
technologies 2 » technologies _, technologies 4
case age » case case, case anne, case a
age data » wage data, cge data, image data
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: technologies 2 information case age data communications costs 4 developpement en afrique.*.