Perhaps you should try some spelling variations:
"CADTH optimal coarse reports" » "CADTH optimal care reports", "CADTH optimal core reports", "CADTH optimal cost reports", "CADTH optimal false reports"
"CADTH optimal sparse reports" » "CADTH optimal spare reports", "CADTH optimally sparse reports", "CADTH optimal space reports", "CADTH optimal spyware reports", "CADTH optimal false reports", "CADTH optimal state reports"
"cadth optimal case reports" » "path optimal case reports", "width optimal case reports", "health optimal case reports", "cadth optimal care reports", "cadth optimal cash reports", "cadth optimal class reports", "cadth optimal case report"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("cadth optimal case reports") OR ((("CADTH optimal coarse reports") OR ("CADTH optimal sparse reports")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cadth optimal case reports\") or (((\"CADTH optimal coarse reports\") OR (\"CADTH optimal sparse reports\"))))".
• Removing quotes may allow a broader search: (( cadth optimal case reports ) or ((( CADTH optimal coarse reports ) OR ( CADTH optimal sparse reports )))).
• Adding a wildcard symbol may retrieve word variants: (("cadth optimal case reports") or ((("CADTH optimal coarse reports") OR ("CADTH optimal sparse reports"))))*.