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