Perhaps you should try some spelling variations:
"a largest decrease" » "a largest decreases" (Expand Search), "a larger decrease" (Expand Search), "a marked decrease" (Expand Search), "_ largest decrease" (Expand Search), "a large decrease" (Expand Search), "a latest decrease" (Expand Search)
"c2 cases increased" » "c2 rate increased" (Expand Search), "c2 levels increased" (Expand Search), "152 cases increased" (Expand Search), "chd cases increased" (Expand Search), "123 cases increased" (Expand Search)
"c large decrease" » "c marked decrease" (Expand Search), "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: "((((\"a largest decrease\") OR (\"c large decrease\"))) OR (\"c2 cases increased\"))~".
• Removing quotes may allow a broader search: (((( a largest decrease ) OR ( c large decrease ))) OR ( c2 cases increased ))~.
• Adding a wildcard symbol may retrieve word variants: (((("a largest decrease") OR ("c large decrease"))) OR ("c2 cases increased"))*.