Perhaps you should try some spelling variations:
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"national science services b:, physics" » "natural science services b:, physics", "spatial science services b:, physics", "natural sciences services b:, physics", "national science service b:, physics", "national science overview b:, physics", "national voice services b:, physics", "national science services big:, physics", "national science services best:, physics"
"animal science series b:, physics" » "animal science stories b:, physics", "animal science theories b:, physics", "animal sciences serious b:, physics", "animal science series 2:, physics", "animal science series 1:, physics", "animal science series 10:, 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 services b:, physics"))) OR ("animal science series b:, physics")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"national science series b:, physics\") OR (\"national science services b:, physics\"))) or (\"animal science series b:, physics\"))".
• Removing quotes may allow a broader search: (((( national science series b:, physics ) OR ( national science services b:, physics ))) or ( animal science series b:, physics )).
• Adding a wildcard symbol may retrieve word variants: (((("national science series b:, physics") OR ("national science services b:, physics"))) or ("animal science series b:, physics"))*.