Perhaps you should try some spelling variations:
"weil's criterion" » "kelly's criterion", "white's criterion", "levy's criterion"
"filter criteria" » "inter criteria", "better criteria", "floor criteria"
"cient criteria" » "diet criteria", "consent criteria", "current criteria"
"weyl's criterion" » "well'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 ("weil's criterion"))) OR ((("cient criteria") OR ("filter criteria")))).
• Removing quotes may allow a broader search: (((( weyl's criterion ) or ( weil's criterion ))) or ((( cient criteria ) or ( filter criteria )))).
• Adding a wildcard symbol may retrieve word variants: (((("weyl's criterion") or ("weil's criterion"))) or ((("cient criteria") or ("filter criteria"))))*.