Perhaps you should try some spelling variations:
developpement durable » developpement de
2.4 communication » 2.14 communication, 5.4 communication, 2.3 communication
technology trade » technology trends, technology transfer, technology transfers
a developpement » au developpement, de developpement, le developpement
rate 2.4 » rate 5.4, rate 4, rate 4.3
costs a » costs _, costs 4
a rate » a race, a rare, 3 rate

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

• Adding a wildcard symbol may retrieve word variants: technology trade integration a rate 2.4 communication costs a developpement durable afrique.*.