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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• 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 series c:, mathematical and medical sciences") OR ("social science series 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 (\"natural sciences series c:, mathematical and medical sciences\"))) or (((\"spatial science series c:, mathematical and medical sciences\") or (\"social science series c:, 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 series c:, mathematical and medical sciences ) or ( social science series c:, 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 series c:, mathematical and medical sciences") or ("social science series c:, mathematical and medical sciences"))))*.