Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
development center » development case
urban development » human development
relative incomes » relative income
incomes policy » notes policy
technology 4 » technology _, technology 1, technology 3
costs urban » cost urban, across urban, crisis urban
4 relative » _ relative, a relative, 3 relative
policy 3.1 » policy 1
center 21 » center 2.1, centers 21, center 1

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

• Adding a wildcard symbol may retrieve word variants: technology 4 relative incomes policy 3.1 communications costs urban development center 21.*.