Perhaps you should try some spelling variations:
"nato science theories b:, physics" » "nato science three 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", "national science theories 3:, physics"
"nato science theory 3:, physics" » "national science theory 3:, physics"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• 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") OR ("radio 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\") OR (\"radio 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 ) OR ( radio 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") OR ("radio science theory 3:, physics"))))))*.