Perhaps you should try some spelling variations:
"nato science theories 1:, physics" » "nato science theory 1:, physics", "national science theories 1:, physics", "nato science theories 3:, physics", "nato science theories 4:, physics", "nato science theories 2:, physics"
"radio science theories 1:, physics" » "radio science theory 1:, physics", "radio science theories 3:, physics", "radio science theories 4:, physics", "radio science theories 2:, physics"
"nato science three b:, physics" » "nato science thin b:, physics", "nato science third b:, physics", "national science three b:, physics", "nato science three big:, physics", "nato science three 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 three b:, physics") OR ((("nato science theories 1:, physics") OR ("radio science theories 1:, physics")))).
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• Adding a wildcard symbol may retrieve word variants: (("nato science three b:, physics") or ((("nato science theories 1:, physics") or ("radio science theories 1:, physics"))))*.