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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nato sciences serious 2:, physics") OR ((("nano sciences serious 2:, physics") OR ("nano science serious 2:, physics"))))) OR ("nato science stories 2:, physics")).
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• Adding a wildcard symbol may retrieve word variants: (((("nato sciences serious 2:, physics") or ((("nano sciences serious 2:, physics") OR ("nano science serious 2:, physics"))))) or ("nato science stories 2:, physics"))*.