Perhaps you should try some spelling variations:
"natural sciences stories b:, physics" » "natural sciences studies b:, physics", "natural sciences theories b:, physics", "natural sciences soviet b:, physics", "natural sciences stories _:, physics", "natural sciences stories a:, physics", "natural sciences stories c:, physics"
"natural science stories b:, physics" » "natural science studies b:, physics", "natural science theories b:, physics", "natural science services b:, physics", "natural science stories _:, physics", "natural science stories a:, physics", "natural science stories c:, physics"
"natural science series b:, physics" » "natural science services b:, physics", "natural science theories b:, physics", "natural sciences serious b:, physics", "natural science series 1:, physics", "natural science series 10:, physics", "natural science series 11:, 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: (((("natural science stories b:, physics") OR ("natural science series b:, physics"))) OR ("natural sciences stories b:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"natural science stories b:, physics\") OR (\"natural science series b:, physics\"))) or (\"natural sciences stories b:, physics\"))".
• Removing quotes may allow a broader search: (((( natural science stories b:, physics ) OR ( natural science series b:, physics ))) or ( natural sciences stories b:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((("natural science stories b:, physics") OR ("natural science series b:, physics"))) or ("natural sciences stories b:, physics"))*.