Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
information rates » information states, information ratio, information rules
developpement du » developpement de, developpement des, developpement et
der information » insider information, sector information, labor information
4 developpement » de developpement, le developpement, et developpement
technology der » technology does, technology 4ir, technology dlt
du afrique » en afrique, l afrique, de l'afrique
space 3.1 » space 2.1, space 3.2, space 3.3
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 der information rates space 3.1 communications costs 4 developpement du afrique.*.