Perhaps you should try some spelling variations:
"safety in chemistry, dangerous good" » "safety in chemistry, dangerous goods", "safety in chemistry, dangerous dead", "safety in chemistry, dangerous how"
"safety in chemistry, dangerous both" » "safety in chemistry, dangerous how"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"safety in chemistry, dangerous good\") OR (\"safety in chemistry, dangerous both\"))".
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