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