Perhaps you should try some spelling variations:
"human costs periodicals." » "human coasts periodicals.", "human pests periodicals.", "human sports periodicals.", "human cost periodicals.", "human cosmos periodicals.", "human cases periodicals."
"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 cost 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 costs periodicals."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("human bees periodicals.") OR ((("human case periodicals.") OR ("human costs periodicals."))))*.
• Removing quotes may allow a broader search: (( human bees periodicals. ) or ((( human case periodicals. ) or ( human costs periodicals. ))))*.