Perhaps you should try some spelling variations:
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"nato science stories _:, physics" » "nato science studies _:, physics", "nato science theories _:, physics", "nato science services _:, physics", "radio science stories _:, physics", "national science stories _:, physics"
"nato science series b:, physics" » "nato science services b:, physics", "nato science theories b:, physics", "nato sciences serious b:, physics", "radio science series b:, physics", "national science series b:, physics", "nato science series 1:, physics", "nato science series 10:, physics", "nato science series 11:, 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 stories _:, physics"))) OR ("nato science series b:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science stories b:, physics\") OR (\"nato science stories _:, physics\"))) or (\"nato science series b:, physics\"))".
• Removing quotes may allow a broader search: (((( nato science stories b:, physics ) OR ( nato science stories _:, physics ))) or ( nato science series b:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((("nato science stories b:, physics") OR ("nato science stories _:, physics"))) or ("nato science series b:, physics"))*.