Perhaps you should try some spelling variations:
"human genes periodicals." » "human genomes periodicals.", "human games periodicals.", "human gages periodicals.", "human gene periodicals.", "human genetics periodicals.", "human genetic periodicals."
"human gases periodicals." » "human games periodicals.", "human leases periodicals.", "human gas periodicals.", "human cases periodicals.", "human causes periodicals.", "human gamers periodicals."
"human bees periodicals." » "human diabetes periodicals.", "human indexes periodicals.", "human devices periodicals.", "human bites periodicals.", "human beast periodicals.", "human bones periodicals."

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: (((("human genes periodicals.") OR ("human gases periodicals."))) OR ("human bees periodicals."))~.
• Removing quotes may allow a broader search: (((( human genes periodicals. ) or ( human gases periodicals. ))) or ( human bees periodicals. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("human genes periodicals.") or ("human gases periodicals."))) or ("human bees periodicals."))*.