Perhaps you should try some spelling variations:
"human fishes periodicals." » "human fisheries periodicals.", "human diseases periodicals.", "human measures periodicals.", "human fitness periodicals.", "human foibles periodicals.", "human figures periodicals."
"human gases periodicals." » "human leases periodicals.", "human gas periodicals.", "human nurses periodicals.", "human cases periodicals.", "human causes periodicals.", "human gamers periodicals."
"human games periodicals." » "human ages periodicals.", "human homes periodicals.", "human genomes periodicals.", "human gamers periodicals.", "human game periodicals.", "human gametes periodicals."

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

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