Perhaps you should try some spelling variations:
thought communication » through communication, trough communication, about communication
communication cost » communication costs, communication costa, communications costs
urban development » human development
development case » development china
relations 4.3 » relations 6.3, relations 3, relations 2.1
risk thought » risk through, his thought, greek thought
cost urban » most urban, worst urban, bust urban
case case » base case, case based, use case
4.3 risk » 3.3 risk, 5.3 risk

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

• Adding a wildcard symbol may retrieve word variants: technology _ relations 4.3 risk thought communication cost urban development case case.*.