Perhaps you should try some spelling variations:
"critical" » "criticsl"
"critica" » "critics"
"criticala" » "criticsla", "criticaland", "critically", "criticas"
"criticalto" » "criticslto", "criticality", "criticalfor", "critically"
"criticsa" » "critics", "criticsm", "criticism"

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: ("critical" OR ((("critica" OR "criticsa") OR ("criticala" OR "criticalto")) OR ("criticala" OR "criticalto"))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(\"critical\" or (((\"critica\" or \"criticsa\") or (\"criticala\" OR \"criticalto\")) or (\"criticala\" OR \"criticalto\")))".
• Removing quotes may allow a broader search: ( critical or ((( critica or criticsa ) or ( criticala OR criticalto )) or ( criticala OR criticalto ))).
• Adding a wildcard symbol may retrieve word variants: ("critical" or ((("critica" or "criticsa") or ("criticala" OR "criticalto")) or ("criticala" OR "criticalto")))*.