Perhaps you should try some spelling variations:
"nuclear physics, heavy sour, hadrons" » "nuclear physics, heavy hour, hadrons", "nuclear physics, heavy hours, hadrons", "nuclear physics, heavy smoker, hadrons"
"nuclear physics, heavy ions, hadrons" » "nuclear physics, heavy sons, hadrons", "nuclear physics, heavy ion, hadrons", "nuclear physics, heavy ins, hadrons"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("nuclear physics, heavy sour, hadrons") OR ("nuclear physics, heavy ions, hadrons")).
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• Adding a wildcard symbol may retrieve word variants: (("nuclear physics, heavy sour, hadrons") or ("nuclear physics, heavy ions, hadrons"))*.