Perhaps you should try some spelling variations:
south communications » mouth communications, month communication, truth communication
communications paths » communication paths, communications pt, communications water
selection 13.3.3 » selection 13.3.2, detection 13.3.3, selection 1.6.3
been developed » between developed, less developed, both developed
13.3.3 trade » 13.3.3 trace, 5.3.3 trade, 12.3 trade
trade south » trade routes
developed 3 » developed _, developed 4, developed 5
paths been » paths between
3 action » 3 actions, 2 action, 4 action

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

• Adding a wildcard symbol may retrieve word variants: technology _ selection 13.3.3 trade south communications paths been developed 3 action.*.