Perhaps you should try some spelling variations:
"c marked decrease" » "c marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked decrease" (Expand Search)
"d cases increased" » "d rate increased" (Expand Search), "d levels increased" (Expand Search), "ad cases increased" (Expand Search), "_ cases increased" (Expand Search), "3 cases increased" (Expand Search)
"c large decrease" » "c large increases" (Expand Search), "c large degree" (Expand Search), "_ large decrease" (Expand Search), "a large decrease" (Expand Search), "i large decrease" (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: "((((\"c large decrease\") OR (\"c marked decrease\"))) OR (\"d cases increased\"))~".
• Removing quotes may allow a broader search: (((( c large decrease ) OR ( c marked decrease ))) OR ( d cases increased ))~.
• Adding a wildcard symbol may retrieve word variants: (((("c large decrease") OR ("c marked decrease"))) OR ("d cases increased"))*.