Perhaps you should try some spelling variations:
concerns criteria » cancer criteria, concept criteria, contests criteria
weil's criterion » weyl's criterion, kelly's criterion, white's criterion
well's criterion » weyl's criterion, kelly's criterion, kelly 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: (((( weil's criterion ) OR ( well's criterion ))) OR ( concerns criteria )).
• Adding a wildcard symbol may retrieve word variants: (((( weil's criterion ) or ( well's criterion ))) or ( concerns criteria ))*.