Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
development central » development general, development centre, development cultural
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
port development » export development, airport development, forest development
risk relations » risk regulations, milk relations, risk reductions
relations a » relations _
polity 3.1 » policy 3.1, polity 3.3, policy 3.3
costs port » costs part, costs export, costs short
a polity » a policy, _ polity, 4 polity

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

• Adding a wildcard symbol may retrieve word variants: technology risk relations a polity 3.1 communications costs port development central labor.*.