Perhaps you should try some spelling variations:
"concerns criteria" » "cancer criteria", "contests criteria", "consensus criteria"
"linker's criteria" » "funder's criteria"
"concept criteria" » "consent criteria", "contest criteria", "context 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 ((("linker's criteria") OR ((("concerns criteria") OR ("concept criteria")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"weyl's criterion\") or (((\"linker's criteria\") or (((\"concerns criteria\") OR (\"concept criteria\"))))))".
• Removing quotes may allow a broader search: (( weyl's criterion ) or ((( linker's criteria ) or ((( concerns criteria ) OR ( concept criteria )))))).
• Adding a wildcard symbol may retrieve word variants: (("weyl's criterion") or ((("linker's criteria") or ((("concerns criteria") OR ("concept criteria"))))))*.