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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"safety in chemistry, dangerous good\") OR (\"safety in chemistry, dangerous goods\"))".
• Removing quotes may allow a broader search: (( safety in chemistry, dangerous good ) OR ( safety in chemistry, dangerous goods )).
• Adding a wildcard symbol may retrieve word variants: (("safety in chemistry, dangerous good") OR ("safety in chemistry, dangerous goods"))*.