Perhaps you should try some spelling variations:
"article and nuclear physical" » "article and nuclear physics", "article and nonlinear physical", "article and nuclear medical"
"articles and nuclear physical" » "articles and nuclear physics", "articles and nonlinear physical", "articles and nuclear medical"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"article and nuclear physical\") OR (\"articles and nuclear physical\"))".
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