Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
developpement de » developpement des, developpement durable
based isolation » base isolation, based solution, based violation
isolation cross » isolation class, inflation across, resolution cross
cross rice » cross price, crops rice, cross river
de afrique » de l'afrique, en afrique, l afrique
rice 3.1 » rice 2.1, rice 3.3, rice 4.1

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

• Adding a wildcard symbol may retrieve word variants: technology based isolation cross rice 3.1 communications costs _ developpement de afrique.*.