Perhaps you should try some spelling variations:
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"natural science series b:, physics" » "natural sciences series b:, physics", "natural science services b:, physics", "natural science stories b:, physics", "natural science theories b:, physics", "natural science series 1:, physics", "natural science series 11:, physics", "natural science series 12:, physics"
"natural science series 10:, physics" » "natural sciences series 10:, physics", "natural science services 10:, physics", "natural science stories 10:, physics", "natural science theories 10:, physics", "natural science series 1:, physics", "natural science series 3:, physics", "natural science series 2:, physics"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("national science series b:, physics") OR ((("natural science series b:, physics") OR ("natural science series 10:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"national science series b:, physics\") or (((\"natural science series b:, physics\") OR (\"natural science series 10:, physics\"))))".
• Removing quotes may allow a broader search: (( national science series b:, physics ) or ((( natural science series b:, physics ) OR ( natural science series 10:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("national science series b:, physics") or ((("natural science series b:, physics") OR ("natural science series 10:, physics"))))*.