Perhaps you should try some spelling variations:
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"natural sciences series c:, mathematical and medical sciences" » "natural sciences series c:, mathematical and social sciences", "natural sciences services c:, mathematical and medical sciences", "natural sciences serious c:, mathematical and medical sciences", "natural sciences stories c:, mathematical and medical sciences"
"spatial science theories 1.3:, mathematical and medical sciences" » "spatial science theories 1.3:, mathematical and social sciences", "spatial science theory 1.3:, mathematical and medical sciences", "spatial science three 1.3:, mathematical and medical sciences", "social science theories 1.3:, mathematical and medical sciences", "spatial science theories 1.4:, mathematical and medical sciences", "spatial science theories 13:, mathematical and medical sciences", "spatial science theories 3:, 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 ("natural sciences series c:, mathematical and medical sciences"))) OR ("spatial science theories 1.3:, 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 (\"natural sciences series c:, mathematical and medical sciences\"))) or (\"spatial science theories 1.3:, mathematical and medical sciences\"))".
• Removing quotes may allow a broader search: (((( national science series c:, mathematical and medical sciences ) OR ( natural sciences series c:, mathematical and medical sciences ))) or ( spatial science theories 1.3:, mathematical and medical sciences )).
• Adding a wildcard symbol may retrieve word variants: (((("national science series c:, mathematical and medical sciences") OR ("natural sciences series c:, mathematical and medical sciences"))) or ("spatial science theories 1.3:, mathematical and medical sciences"))*.