Perhaps you should try some spelling variations:
"nuclear physics, heavy sour, hadrons" » "nuclear physics, heavy hours, hadrons", "nuclear physics, heavy smoker, hadrons"
"nuclear physics, heavy hour, hadrons" » "nuclear physics, heavy hours, hadrons", "nuclear physics, heavy haul, hadrons", "nuclear physics, heavy hole, hadrons"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nuclear physics, heavy sour, hadrons\") OR (\"nuclear physics, heavy hour, hadrons\"))".
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