Perhaps you should try some spelling variations:
"human bites periodicals." » "human sites periodicals.", "human bikes periodicals.", "human mites periodicals.", "human bile periodicals.", "human beings periodicals.", "human bodies periodicals."
"human games periodicals." » "human gases periodicals.", "human ages periodicals.", "human homes periodicals.", "human gamers periodicals.", "human game periodicals.", "human gametes periodicals."
"humans bite periodicals." » "humans bible periodicals.", "humans suite periodicals.", "humans life periodicals.", "humans biting periodicals."

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

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