Perhaps you should try some spelling variations:
state environmental » trade environmental, water environmental, strategic environmental
sites environmental » water environmental, firms environmental, business environmental
sea environmental » weak environmental, _ environmental, 2 environmental
key environmental » _ environmental, 2 environmental
sustainable rural » sustainable urban, sustainable use, sustainable resource
rural development » social development
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)) report. europe and central ((((((sea environmental) OR (sites environmental))) or (key environmental))) or (state environmental)) and socially sustainable rural development africa.~.
• If you are trying to use Boolean operators, they must be ALL CAPS: world ((bank technical) OR (a technical)) report. europe AND central ((((((sea environmental) OR (sites environmental))) OR (key environmental))) OR (state environmental)) AND socially sustainable rural development africa..
• The words AND, OR and NOT may confuse the search; try adding quotes: "world ((bank technical) or (a technical)) report. europe and central ((((((sea environmental) OR (sites environmental))) or (key environmental))) or (state environmental)) and socially sustainable rural development africa.".
• Adding a wildcard symbol may retrieve word variants: world ((bank technical) or (a technical)) report. europe and central ((((((sea environmental) OR (sites environmental))) or (key environmental))) or (state environmental)) and socially sustainable rural development africa.*.