Perhaps you should try some spelling variations:
"national science series 2:, physics" » "natural science series 2:, physics", "spatial science series 2:, physics", "animal science series 2:, physics", "national science services 2:, physics", "national science stories 2:, physics", "national sciences serious 2:, physics", "national science series 3:, physics"
"radio science theories 2:, physics" » "radio science theory 2:, physics", "radio science theories 3:, physics", "radio science theories 4:, physics", "radio science theories 1:, physics"
"radio science three 2:, physics" » "radio science thin 2:, physics", "radio science third 2:, physics", "radio science three 12:, physics", "radio science three 20:, physics", "radio science three 22:, 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 2:, physics") OR ((("radio science theories 2:, physics") OR ("radio science three 2:, physics")))).
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• Adding a wildcard symbol may retrieve word variants: (("national science series 2:, physics") or ((("radio science theories 2:, physics") or ("radio science three 2:, physics"))))*.