Perhaps you should try some spelling variations:
"dioxin emissions" » "down emissions", "oxide emissions", "union emissions"
"dioxide emission" » "oxide emissions"
"dioxide emissions" » "oxide emissionss"
"toxic emissions" » "atomic emission", "oxide emissions", "voc emissions"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("toxic emissions") OR ((("dioxin emissions") OR ((("dioxide emission") OR ("dioxide emissions")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"toxic emissions\") or (((\"dioxin emissions\") or (((\"dioxide emission\") OR (\"dioxide emissions\"))))))".
• Removing quotes may allow a broader search: (( toxic emissions ) or ((( dioxin emissions ) or ((( dioxide emission ) OR ( dioxide emissions )))))).
• Adding a wildcard symbol may retrieve word variants: (("toxic emissions") or ((("dioxin emissions") or ((("dioxide emission") OR ("dioxide emissions"))))))*.