Perhaps you should try some spelling variations:
"nato science stories b:, physics" » "nato science studies b:, physics", "nato science theories b:, physics", "radio science stories b:, physics", "national science stories b:, physics", "nato science stories a:, physics", "nato science stories c:, physics", "nato science stories 2:, physics"
"nato science stories _:, physics" » "nato science studies _:, physics", "nato science theories _:, physics", "radio science stories _:, physics", "national science stories _:, physics"
"nato science series _:, physics" » "nato science services _:, physics", "nato science theories _:, physics", "nato sciences serious _:, physics", "radio science series _:, physics", "national science series _:, 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 _:, 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 _:, physics\"))))".
• Removing quotes may allow a broader search: (( nato science stories b:, physics ) or ((( nato science stories _:, physics ) OR ( nato science series _:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science stories b:, physics") or ((("nato science stories _:, physics") OR ("nato science series _:, physics"))))*.