Perhaps you should try some spelling variations:
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"national science series c:, mathematical and social sciences" » "natural science series c:, mathematical and social sciences", "animal science series c:, mathematical and social sciences", "natural sciences series c:, mathematical and social sciences", "national science services c:, mathematical and social sciences", "national science stories c:, mathematical and social sciences", "national sciences serious c:, mathematical and social sciences"
"spatial science theories c:, mathematical and medical sciences" » "spatial science theory c:, mathematical and medical sciences", "spatial science three c:, mathematical and medical sciences", "social science theories c:, mathematical and medical sciences", "spatial science theories 1:, mathematical and medical sciences"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("national science series c:, mathematical and medical sciences") OR ("national science series c:, mathematical and social sciences"))) OR ("spatial science theories c:, mathematical and medical sciences")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"national science series c:, mathematical and medical sciences\") OR (\"national science series c:, mathematical and social sciences\"))) or (\"spatial science theories c:, mathematical and medical sciences\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("national science series c:, mathematical and medical sciences") OR ("national science series c:, mathematical and social sciences"))) or ("spatial science theories c:, mathematical and medical sciences"))*.