Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
4 developpement » de developpement, le developpement, et developpement
technology 1 » technology _
reaction law » reaction a, reaction rate, reaction ball
des afrique » en afrique, de l'afrique
1 reaction » 1 reactions, _ reaction, a reaction
law rate » low rate, flow rate, law state
rate 2.3 » rates 2.3, rate 2.4, rate 4.3
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 reaction law rate 2.3 communication costs 4 developpement des afrique.*.