Perhaps you should try some spelling variations:
"advances in chemistry sources" » "advances in chemistry courses", "advances in chemistry surfaces", "advances in chemistry studies"
"advances in chemistry some" » "advances in chemistry solid", "advances in chemistry social"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("advances in chemistry sources") OR ("advances in chemistry some")).
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