Perhaps you should try some spelling variations:
"nato science theories 3:, physics" » "nato science theory 3:, physics", "radio science theories 3:, physics", "national science theories 3:, physics"
"nato science three 4:, physics" » "nato science thin 4:, physics", "radio science three 4:, physics", "national science three 4:, physics", "nato science three _:, physics", "nato science three a:, physics", "nato science three 8:, physics"
"nato science third 4:, physics" » "nato science thin 4:, physics", "nato science theory 4:, physics", "radio science third 4:, physics", "national science third 4:, physics", "nato science third _:, physics", "nato science third a:, physics", "nato science third c:, 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 3:, physics") OR ((("nato science three 4:, physics") OR ("nato science third 4:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nato science theories 3:, physics\") or (((\"nato science three 4:, physics\") OR (\"nato science third 4:, physics\"))))".
• Removing quotes may allow a broader search: (( nato science theories 3:, physics ) or ((( nato science three 4:, physics ) OR ( nato science third 4:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science theories 3:, physics") or ((("nato science three 4:, physics") OR ("nato science third 4:, physics"))))*.