Perhaps you should try some spelling variations:
"cadth optimal care reports" » "path optimal care reports", "width optimal care reports", "health optimal care reports", "cadth optimal care report", "cadth optimal care resorts", "cadth optimal charge reports"
"CADTH optimal case reports" » "CADTH optimal coarse reports", "CADTH optimal class reports", "CADTH optimal cache reports", "CADTH optimal case report"
"CADTH optimal cash reports" » "CADTH optimal hash reports", "CADTH optimal class reports", "CADTH optimal cache reports", "CADTH optimal crash reports", "CADTH optimal cases reports", "CADTH optimal flash reports"

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