Perhaps you should try some spelling variations:
"concerns criteria" » "concept criteria", "contests criteria", "consensus criteria"
"levy's criterion" » "kelly's criterion", "lane's criterion", "level criterion"
"cancer criteria" » "inter criteria", "cancer arterial", "cancer bacteria"
"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 ((("concerns criteria") OR ("cancer criteria")))).
• Removing quotes may allow a broader search: (((( weyl's criterion ) or ( levy's criterion ))) or ((( concerns criteria ) or ( cancer criteria )))).
• Adding a wildcard symbol may retrieve word variants: (((("weyl's criterion") or ("levy's criterion"))) or ((("concerns criteria") or ("cancer criteria"))))*.