Perhaps you should try some spelling variations:
"national science series b:, physics" » "natural science series b:, physics", "spatial science series b:, physics", "animal science series b:, physics", "national science services b:, physics", "national science theories b:, physics", "national sciences serious b:, physics", "national science series 1:, physics", "national science series 10:, physics", "national science series 11:, physics"
"national science stories _:, physics" » "natural science stories _:, physics", "spatial science stories _:, physics", "animal science stories _:, physics", "national science studies _:, physics", "national science theories _:, physics"
"national science stories c:, physics" » "natural science stories c:, physics", "spatial science stories c:, physics", "animal science stories c:, physics", "national science studies c:, physics", "national science theories c:, physics"
"national science stories a:, physics" » "natural science stories a:, physics", "spatial science stories a:, physics", "animal science stories a:, physics", "national science studies a:, physics", "national science theories a:, 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 ((("national science stories _:, physics") OR ((("national science stories c:, physics") OR ("national science stories a:, physics")))))).
• Removing quotes may allow a broader search: (( national science series b:, physics ) or ((( national science stories _:, physics ) or ((( national science stories c:, physics ) or ( national science stories a:, physics )))))).
• Adding a wildcard symbol may retrieve word variants: (("national science series b:, physics") or ((("national science stories _:, physics") or ((("national science stories c:, physics") or ("national science stories a:, physics"))))))*.