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