Perhaps you should try some spelling variations:
between communities » between community, salween communities, between communication
communities costs » communities across, communities co, communities cope
urban development » human development
development case » development china
relations 5.1 » relations 2.1, relations 3.1, relations 1
costs urban » cost urban, across urban, crisis urban
20 between » 2 between, 10 between, 30 between
case ten » case two
5.1 20 » 4.1 20, 5.1 2d, 5.1 2012

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

• Adding a wildcard symbol may retrieve word variants: technology _ relations 5.1 20 between communities costs urban development case ten.*.