Perhaps you should try some spelling variations:
development series » development services, development agencies, development africa
s.a environmental » sea environmental, state environmental, weak environmental
technical experts » technical expertise
sustainable urban » sustainable use
urban development » human development
technical paper » technical report
central s.a » central asia, central asian, central java
world a » world _, world war
world 2 » world _, worlds _

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( world a ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ) or ( world 2 ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( world a ((technical paper) OR (technical experts)). europe AND central s.a environmental AND socially sustainable urban development series. ) OR ( world 2 ((technical paper) OR (technical experts)). europe AND central s.a environmental AND socially sustainable urban development series. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( world a ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ) or ( world 2 ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ))".
• Adding a wildcard symbol may retrieve word variants: (( world a ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ) or ( world 2 ((technical paper) OR (technical experts)). europe and central s.a environmental and socially sustainable urban development series. ))*.