Perhaps you should try some spelling variations:
bites periodicals » sites periodicals, bikes periodicals, mites periodicals
games periodicals » gases periodicals, ages periodicals, homes periodicals
cases periodicals » gases periodicals, caves periodicals, classes periodicals
human bites » human bile, humans bite, human beings
human games » human gamers, human game, human gametes
human cases » human causes, human case, human caspases

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 ((( human games periodicals. ) OR ( human cases periodicals. ))))~.
• Adding a wildcard symbol may retrieve word variants: (( human bites periodicals. ) or ((( human games periodicals. ) or ( human cases periodicals. ))))*.