Perhaps you should try some spelling variations:
"environmental history" » "environment history"
"environmental chemistry" » "environment chemistry"
"environmental factors" » "environment factors"

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: (((("environmental history") OR ("environmental chemistry"))) OR ("environmental factors")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"environmental history\") OR (\"environmental chemistry\"))) or (\"environmental factors\"))".
• Removing quotes may allow a broader search: (((( environmental history ) OR ( environmental chemistry ))) or ( environmental factors )).
• Adding a wildcard symbol may retrieve word variants: (((("environmental history") OR ("environmental chemistry"))) or ("environmental factors"))*.