Perhaps you should try some spelling variations:
"levy's criterion" » "kelly's criterion", "lane's criterion", "level criterion"
"wiener criteria" » "wiener criterion", "inter criteria", "filter criteria"
"floor criteria" » "flow criteria", "four criteria", "filter criteria"
"weyl's criterion" » "well's criterion", "weil's criterion"

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: (((("weyl's criterion") OR ("levy's criterion"))) OR ((("wiener criteria") OR ("floor criteria")))).
• Removing quotes may allow a broader search: (((( weyl's criterion ) or ( levy's criterion ))) or ((( wiener criteria ) or ( floor criteria )))).
• Adding a wildcard symbol may retrieve word variants: (((("weyl's criterion") or ("levy's criterion"))) or ((("wiener criteria") or ("floor criteria"))))*.