Perhaps you should try some spelling variations:
"human bees periodicals." » "human diabetes periodicals.", "human indexes periodicals.", "human devices periodicals.", "human bites periodicals.", "human beast periodicals.", "human bones periodicals."
"human case periodicals." » "human cases periodicals.", "human care periodicals.", "human danse periodicals.", "human causes periodicals.", "human cone periodicals."
"human cost periodicals." » "human costs periodicals.", "human coast periodicals.", "human chest 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 case periodicals.") OR ("human cost periodicals."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("human bees periodicals.") OR ((("human case periodicals.") OR ("human cost periodicals."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"human bees periodicals.\") or (((\"human case periodicals.\") OR (\"human cost periodicals.\"))))*".
• Removing quotes may allow a broader search: (( human bees periodicals. ) or ((( human case periodicals. ) OR ( human cost periodicals. ))))*.