Perhaps you should try some spelling variations:
"ct largest decrease" » "ct largest decreases" (Expand Search), "ct larger decrease" (Expand Search), "ct marked decrease" (Expand Search)
"_ largest decrease" » "_ largest decreases" (Expand Search), "_ larger decrease" (Expand Search), "_ marked decrease" (Expand Search), "_ large decrease" (Expand Search)
"d levels increased" » "_ levels increased" (Expand Search), "1 levels increased" (Expand Search), "6 levels increased" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"d levels increased\") OR (((\"ct largest decrease\") OR (\"_ largest decrease\"))))~".
• Removing quotes may allow a broader search: (( d levels increased ) OR ((( ct largest decrease ) OR ( _ largest decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("d levels increased") OR ((("ct largest decrease") OR ("_ largest decrease"))))*.