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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world a technical paper. europe and central asia environmentally and socially sustainable resource development series.") OR ((((("world a technical paper. europe and central asian environmental and socially sustainable urban development series.") OR ("world a technical paper. europe and central asian environmental and socially sustainable human development series."))) OR ((("world war technical paper. europe and central s.a environmental and socially sustainable urban development series.") OR ("world war technical paper. europe and central java environmental and socially sustainable urban development series."))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world a technical paper. europe and central asia environmentally and socially sustainable resource development series.\") or (((((\"world a technical paper. europe and central asian environmental and socially sustainable urban development series.\") OR (\"world a technical paper. europe and central asian environmental and socially sustainable human development series.\"))) or (((\"world war technical paper. europe and central s.a environmental and socially sustainable urban development series.\") or (\"world war technical paper. europe and central java environmental and socially sustainable urban development series.\"))))))~".
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