Perhaps you should try some spelling variations:
development series » development services, development agencies, development africa
urban development » human development
sustainable urban » sustainable use
technical paper » technical experts, technical report
bank technical » a technical
central trade » central rate, neutral trade, cultural trade
general trade » general trends, liberal trade
environmental » environment

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

• Performing a fuzzy search may retrieve terms with similar spellings: world bank technical paper. europe and ((central trade) OR (general trade)) environmental and socially sustainable urban development series.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: world bank technical paper. europe AND ((central trade) OR (general trade)) environmental AND socially sustainable urban development series..
• The words AND, OR and NOT may confuse the search; try adding quotes: "world bank technical paper. europe and ((central trade) OR (general trade)) environmental and socially sustainable urban development series.".
• Adding a wildcard symbol may retrieve word variants: world bank technical paper. europe and ((central trade) OR (general trade)) environmental and socially sustainable urban development series.*.