Perhaps you should try some spelling variations:
"nato science theories b:, physics" » "nato science theory b:, physics", "nato science three b:, physics", "radio science theories b:, physics", "national science theories b:, physics", "nato science theories 3:, physics", "nato science theories 1:, physics", "nato science theories 11:, physics"
"nato science theories 2:, physics" » "nato science theory 2:, physics", "nato science three 2:, physics", "radio science theories 2:, physics", "national science theories 2:, physics", "nato science theories 3:, physics", "nato science theories 1:, physics"
"nato science theories 4:, physics" » "nato science theory 4:, physics", "nato science three 4:, physics", "radio science theories 4:, physics", "national science theories 4:, physics", "nato science theories 3:, 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 theories b:, physics") OR ("nato science theories 2:, physics"))) OR ("nato science theories 4:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science theories b:, physics\") OR (\"nato science theories 2:, physics\"))) or (\"nato science theories 4:, physics\"))".
• Removing quotes may allow a broader search: (((( nato science theories b:, physics ) OR ( nato science theories 2:, physics ))) or ( nato science theories 4:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((("nato science theories b:, physics") OR ("nato science theories 2:, physics"))) or ("nato science theories 4:, physics"))*.