Perhaps you should try some spelling variations:
3.7 communication » 3.2 communication, 2.7 communication, 3.5 communication
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
technology use » technology 1, technology 2.2, technology 3
use induction » rule induction, use reduction, use introduction
induction age » induction one, introduction age, induction after
age change » wage change, age changes, wage changes
change 3.7 » change 3.1, change 3.2, change 3.4
de afrique » de l'afrique, en afrique, l afrique
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 use induction age change 3.7 communication costs 4 developpement de afrique.*.