Perhaps you should try some spelling variations:
"human gases periodicals." » "human games periodicals.", "human leases periodicals.", "human fishes periodicals.", "human cases periodicals.", "human causes periodicals.", "human gamers periodicals.", "human gwases periodicals.", "human gapes periodicals.", "human gises periodicals."
"human bees periodicals." » "human diabetes periodicals.", "human indexes periodicals.", "human devices periodicals.", "human bites periodicals.", "human beast periodicals.", "human bones periodicals."
"human gas periodicals." » "human foods periodicals.", "human birds periodicals.", "human gwas periodicals.", "human gap periodicals.", "human gis periodicals."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("human bees periodicals.") or ((("human gases periodicals.") OR ("human gas periodicals."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("human bees periodicals.") OR ((("human gases periodicals.") OR ("human gas periodicals.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"human bees periodicals.\") or (((\"human gases periodicals.\") OR (\"human gas periodicals.\"))))".
• Removing quotes may allow a broader search: (( human bees periodicals. ) or ((( human gases periodicals. ) OR ( human gas periodicals. )))).
• Adding a wildcard symbol may retrieve word variants: (("human bees periodicals.") or ((("human gases periodicals.") OR ("human gas periodicals."))))*.