Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
past communication » post communication, put communication, master communication
urban development » human development
technology 3 » technology _, technology 1, technology 4
relation 1.1 » relations 1.1, relation 9.1, relations 1.10
crisis past » crisis part, crisis east, crisis post
3 relation » 3 relations, _ relation, 5 relation
1.1 crisis » 11 crisis, 2.1 crisis, 3.1 crisis
cost urban » most urban, worst urban, bust urban

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

• Adding a wildcard symbol may retrieve word variants: technology 3 relation 1.1 crisis past communication cost urban development _ artic.*.