Perhaps you should try some spelling variations:
"nato science overview b:, physics" » "nato science review b:, physics", "nato service overview b:, physics", "nato change overview b:, physics", "radio science overview b:, physics", "national science overview b:, physics", "nato science overview 1:, physics", "nato science overview 1.1:, physics", "nato science overview 1.2:, physics"
"nato science service big:, physics" » "radio science service big:, physics", "national science service big:, physics", "nato science services big:, physics", "nato science service bus:, physics", "nato science service busg:, physics"
"nato science service bi:, physics" » "radio science service bi:, physics", "national science service bi:, physics", "nato science service bus:, 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 overview b:, physics") OR ((("nato science service big:, physics") OR ("nato science service bi:, physics")))).
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• Adding a wildcard symbol may retrieve word variants: (("nato science overview b:, physics") or ((("nato science service big:, physics") or ("nato science service bi:, physics"))))*.