Perhaps you should try some spelling variations:
"human games periodicals." » "human gases periodicals.", "human ages periodicals.", "human homes periodicals.", "human gamers periodicals.", "human game periodicals.", "human gametes periodicals."
"human bites periodicals." » "human sites periodicals.", "human bikes periodicals.", "human mites periodicals.", "human bile periodicals.", "humans bite periodicals.", "human beings periodicals."
"human beta periodicals." » "human delta periodicals.", "human data periodicals.", "human desa periodicals.", "human fetal 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 beta periodicals.") OR ("human bites periodicals."))) OR ("human games periodicals."))~.
• Removing quotes may allow a broader search: (((( human beta periodicals. ) or ( human bites periodicals. ))) or ( human games periodicals. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("human beta periodicals.") or ("human bites periodicals."))) or ("human games periodicals."))*.