Perhaps you should try some spelling variations:
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"nato science series 10:, physics" » "nato science services 10:, physics", "nato science stories 10:, physics", "nato science theories 10:, physics", "radio science series 10:, physics", "nato science series 3:, physics", "nato science series 2:, physics", "nato science series 30:, physics", "nato science series 20:, physics"
"nato science series 1:, physics" » "nato science services 1:, physics", "nato science stories 1:, physics", "nato science theories 1:, physics", "radio science series 1:, physics", "nato science series 3:, physics", "nato science series 2:, 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 series 10:, physics") OR ("nato science series 1:, physics"))) OR ("national science series 10:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science series 10:, physics\") OR (\"nato science series 1:, physics\"))) or (\"national science series 10:, physics\"))".
• Removing quotes may allow a broader search: (((( nato science series 10:, physics ) OR ( nato science series 1:, physics ))) or ( national science series 10:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((("nato science series 10:, physics") OR ("nato science series 1:, physics"))) or ("national science series 10:, physics"))*.