Perhaps you should try some spelling variations:
"human algae periodicals." » "human life periodicals.", "human abuse periodicals.", "human language periodicals."
"human games periodicals." » "human gases periodicals.", "human ages periodicals.", "human homes periodicals.", "human gamers periodicals.", "human game periodicals.", "human gametes periodicals."
"human age periodicals." » "human ages periodicals.", "human care periodicals.", "human change periodicals.", "human agent periodicals.", "human anger periodicals.", "human image 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 games periodicals.") or ((("human age periodicals.") OR ("human algae periodicals."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("human games periodicals.") OR ((("human age periodicals.") OR ("human algae periodicals."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"human games periodicals.\") or (((\"human age periodicals.\") OR (\"human algae periodicals.\"))))*".
• Removing quotes may allow a broader search: (( human games periodicals. ) or ((( human age periodicals. ) OR ( human algae periodicals. ))))*.