Perhaps you should try some spelling variations:
development series » development services, development agencies, development africa
urban development » human development
sustainable urban » sustainable use
central trade » general trade, central rate, neutral trade
a technical » _ technical, 2 technical
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) OR (a technical)) paper. europe and central trade environmental and socially sustainable urban development series.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: world ((bank technical) OR (a technical)) paper. europe AND central trade environmental AND socially sustainable urban development series..
• The words AND, OR and NOT may confuse the search; try adding quotes: "world ((bank technical) OR (a technical)) paper. europe and central trade environmental and socially sustainable urban development series.".
• Adding a wildcard symbol may retrieve word variants: world ((bank technical) OR (a technical)) paper. europe and central trade environmental and socially sustainable urban development series.*.