Perhaps you should try some spelling variations:
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"national science stories b:, physics" » "natural science stories b:, physics", "spatial science stories b:, physics", "animal science stories b:, physics", "national science theories b:, physics", "national science stories a:, physics", "national science stories c:, physics", "national science stories 2:, physics"
"national science studies b:, physics" » "natural science studies b:, physics", "spatial science studies b:, physics", "animal science studies b:, physics", "national science study b:, physics", "national defence studies b:, physics"
"national science stories _:, physics" » "natural science stories _:, physics", "spatial science stories _:, physics", "animal science stories _:, physics", "national science theories _:, physics"

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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 b:, physics") OR ("national science studies b:, physics"))) OR ("national science stories _:, physics")))).
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