Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
developpement la » developpement de, developpement et, developpement du
4 developpement » de developpement, le developpement, et developpement
1 conservation » _ conservation, 4 conservation, a conservation
technology 1 » technology _
efforts from » effects from, exports from, imports from
la afrique » l afrique, la fabrique, en afrique
from 6.2 » from 1.2, from 60, from 12
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 1 conservation efforts from 6.2 communication costs 4 developpement la afrique.*.