Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
isolation states » isolation systems, simulation states, isolation system
from isolation » from innovation, from imitation, from information
4 development » 2 development, 4 developing
states trade » states state, states three
trade 3.2 » trade 2.2, trade 2, trade 4.1
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 from isolation states trade 3.2 communication costs 4 development 1 africa.*.