Perhaps you should try some spelling variations:
social interaction » social interactions, social integration
2.5 communication » 2.3 communication, 2.7 communication, 3.5 communication
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
ecology social » economy social, technology social, ecology sociology
from 2.5 » from 2.3, from 25, from 2.9
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: ecology social interaction effects from 2.5 communication costs a developpement en afrique.*.