Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
trade information » price information, private information, trade integration
technology trade » technology trends, technology transfer, technology transfers
4 communications » 14 communications, 4 communication, 2 communications
a developpement » au developpement, de developpement, le developpement
access race » access rate, access rates, access age
des afrique » en afrique, de l'afrique
costs a » costs _, costs 4
race 4 » race _, rice 4, face 4

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology trade information access race 4 communications costs a developpement des afrique.*.