Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
urban development » human development
3 communications » 3 communication, 2 communications, 4 communications
technology 2.1 » technology 2.2, technology 3.1, technology 1
nation rate » nation race, notation rate, nation state
rate policy » trade policy
costs urban » cost urban, across urban, crisis urban
2.1 nation » 2.1 notation, 2.1 national, 2.1 notations
policy 3 » policy 1
pt box » post box
pt bo » pt b

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technology 2.1 nation rate policy 3 communications costs urban development ((pt box) OR (pt bo)).~".
• Adding a wildcard symbol may retrieve word variants: technology 2.1 nation rate policy 3 communications costs urban development ((pt box) OR (pt bo)).*.