Perhaps you should try some spelling variations:
"nato science stories b:, physics" » "nato science series b:, physics", "nato science theories b:, physics", "radio science stories b:, physics", "national science stories b:, physics", "nato science stories _:, physics", "nato science stories c:, physics", "nato science stories 2:, physics"
"nato science stories a:, physics" » "nato science series a:, physics", "nato science theories a:, physics", "radio science stories a:, physics", "national science stories a:, physics", "nato science stories _:, physics"
"nato science studies b:, physics" » "nato science study b:, physics", "nato defence studies b:, physics", "radio science studies b:, physics", "national science studies b:, physics"

Try widening your search to All Fields.

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