Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
2.3.1 communications » 2.3.1.1 communication, 2.3 communication, 3.1 communication
estimation under » estimation model, estimation de, estimation using
developpement du » developpement de, developpement des, developpement et
a developpement » au developpement, de developpement, le developpement
technology 2.2 » technology _, technology 1, technology 3
2.2 estimation » 2.4 estimation, 3.3 estimation, 4 estimation
under rice » under rise, under river, under risk
rice 2.3.1 » prices 2.3.1, rice 2.1, rice 3.1
du afrique » en afrique, l afrique, de l'afrique
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: technology 2.2 estimation under rice 2.3.1 communications costs a developpement du afrique.*.