Perhaps you should try some spelling variations:
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"nato sciences serious _:, physics" » "nato sciences second _:, physics", "nato sciences section _:, physics", "nature sciences serious _:, physics", "nato's science serious _:, physics", "radio sciences serious _:, physics", "national sciences serious _:, physics"
"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 a:, physics", "nano sciences serious e:, physics"
"nato science stories 2:, physics" » "nato science studies 2:, physics", "nato science series 2:, physics", "nato science theories 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 ("nato sciences serious _:, physics"))) OR ("nano sciences serious 2:, physics"))) OR ("nato science stories 2:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"nato sciences serious 2:, physics\") OR (\"nato sciences serious _:, physics\"))) or (\"nano sciences serious 2:, physics\"))) or (\"nato science stories 2:, physics\"))".
• Removing quotes may allow a broader search: (((((( nato sciences serious 2:, physics ) OR ( nato sciences serious _:, physics ))) or ( nano sciences serious 2:, physics ))) or ( nato science stories 2:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((((("nato sciences serious 2:, physics") OR ("nato sciences serious _:, physics"))) or ("nano sciences serious 2:, physics"))) or ("nato science stories 2:, physics"))*.