Perhaps you should try some spelling variations:
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"nano sciences serious 2:, physics" » "nano sciences second 2:, physics", "nano sciences section 2:, physics", "nano science serious 2:, physics", "_ nanosciences serious 2:, physics", "nanosciences _ serious 2:, physics", "nano sciences serious 72:, physics", "nano sciences serious _:, physics", "nano sciences serious a:, physics"
"nato science theories 2:, physics" » "nato science theory 2:, physics", "nato science three 2:, physics", "radio science theories 2:, physics", "national science theories 2:, physics", "nato science theories 3:, physics", "nato science theories 4:, physics", "nato science theories 1:, physics"
"nato science stories 2:, physics" » "nato science studies 2:, physics", "nato science series 2:, physics", "radio science stories 2:, physics", "national science stories 2:, physics", "nato science stories _:, physics", "nato science stories a:, physics", "nato science stories c:, physics"

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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 ((("nato science stories 2:, physics") OR ("nato science theories 2:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato sciences serious 2:, physics\") or (\"nano sciences serious 2:, physics\"))) or (((\"nato science stories 2:, physics\") OR (\"nato science theories 2:, physics\"))))".
• Removing quotes may allow a broader search: (((( nato sciences serious 2:, physics ) or ( nano sciences serious 2:, physics ))) or ((( nato science stories 2:, physics ) OR ( nato science theories 2:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (((("nato sciences serious 2:, physics") or ("nano sciences serious 2:, physics"))) or ((("nato science stories 2:, physics") OR ("nato science theories 2:, physics"))))*.