Perhaps you should try some spelling variations:
"human diabetes periodicals." » "human states periodicals.", "human diseases periodicals.", "human indexes periodicals.", "human diabetic periodicals.", "fuhrman diabetes periodicals.", "human gametes periodicals."
"human bees periodicals." » "human indexes periodicals.", "human devices periodicals.", "human genomes 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."

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