Perhaps you should try some spelling variations:
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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 1:, physics") OR ((("nato science stories 1:, physics") OR ("nato science stories 12:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nato science series 1:, physics\") or (((\"nato science stories 1:, physics\") OR (\"nato science stories 12:, physics\"))))".
• Removing quotes may allow a broader search: (( nato science series 1:, physics ) or ((( nato science stories 1:, physics ) OR ( nato science stories 12:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science series 1:, physics") or ((("nato science stories 1:, physics") OR ("nato science stories 12:, physics"))))*.