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