Perhaps you should try some spelling variations:
"national science stories c:, mathematical and medical sciences" » "spatial science stories c:, mathematical and medical sciences", "animal science stories c:, mathematical and medical sciences", "natural sciences stories c:, mathematical and medical sciences", "national science stories c:, mathematical and social sciences", "national science studies c:, mathematical and medical sciences", "national science series c:, mathematical and medical sciences", "national science theories c:, mathematical and medical sciences", "national science stories _:, mathematical and medical sciences", "national science stories a:, mathematical and medical sciences", "national science stories 2:, mathematical and medical sciences"
"natural science stories c:, mathematical and physical sciences" » "natural science studies c:, mathematical and physical sciences", "natural science series c:, mathematical and physical sciences", "natural science theories c:, mathematical and physical sciences", "natural sciences stories c:, mathematical and physical sciences", "natural science stories _:, mathematical and physical sciences", "natural science stories a:, mathematical and physical sciences", "natural science stories 2:, mathematical and physical sciences"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"national science stories c:, mathematical and medical sciences\") OR (\"natural science stories c:, mathematical and physical sciences\"))".
• Removing quotes may allow a broader search: (( national science stories c:, mathematical and medical sciences ) OR ( natural science stories c:, mathematical and physical sciences )).
• Adding a wildcard symbol may retrieve word variants: (("national science stories c:, mathematical and medical sciences") OR ("natural science stories c:, mathematical and physical sciences"))*.