Perhaps you should try some spelling variations:
asia environmentally » _ environmentally, aqaba environmental
development services » development agencies, development process, development africa
development series » development agencies, development africa, development strategies
sea environmental » weak environmental, key environmental, state environmental
sustainable rural » sustainable urban, sustainable use, sustainable resource
a technical » _ technical, 2 technical

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 ((((asia environmentally) or (sea environmental))) or (trade environmental)) and socially sustainable rural ((development series) OR (development services)).~.
• If you are trying to use Boolean operators, they must be ALL CAPS: world ((bank technical) OR (a technical)) paper. europe AND central ((((asia environmentally) OR (sea environmental))) OR (trade environmental)) AND socially sustainable rural ((development series) OR (development services))..
• The words AND, OR and NOT may confuse the search; try adding quotes: "world ((bank technical) or (a technical)) paper. europe and central ((((asia environmentally) or (sea environmental))) or (trade environmental)) and socially sustainable rural ((development series) OR (development services)).".
• Adding a wildcard symbol may retrieve word variants: world ((bank technical) or (a technical)) paper. europe and central ((((asia environmentally) or (sea environmental))) or (trade environmental)) and socially sustainable rural ((development series) OR (development services)).*.