Perhaps you should try some spelling variations:
"particle and nonlinear physical" » "particle and nonlinear physics", "particle and nonlinear chemical", "particle and nonlinear optical"
"article and nonlinear physical" » "article and nonlinear physics", "article and nonlinear chemical", "article and nonlinear optical"

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