Perhaps you should try some spelling variations:
"ct largest decrease" » "ct largest decreases" (Expand Search), "ct larger decrease" (Expand Search), "_ largest decrease" (Expand Search)
"ad cases increased" » "ad rate increased" (Expand Search), "ad levels increased" (Expand Search), "all cases increased" (Expand Search), "19 cases increased" (Expand Search), "_ cases increased" (Expand Search)
"ct marked decrease" » "ct marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked decrease" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("ad cases increased") OR ((("ct largest decrease") OR ("ct marked decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ad cases increased\") OR (((\"ct largest decrease\") OR (\"ct marked decrease\"))))".
• Removing quotes may allow a broader search: (( ad cases increased ) OR ((( ct largest decrease ) OR ( ct marked decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("ad cases increased") OR ((("ct largest decrease") OR ("ct marked decrease"))))*.