Perhaps you should try some spelling variations:
"_ large decrease" » "_ marked decrease" (Expand Search), "_ large increases" (Expand Search), "_ large degree" (Expand Search)
"c large decrease" » "c marked decrease" (Expand Search), "c large increases" (Expand Search), "c large degree" (Expand Search), "a large decrease" (Expand Search), "i large decrease" (Expand Search), "b large decrease" (Expand Search)
"c2 levels increased" » "2 levels increased" (Expand Search), "c levels increased" (Expand Search), "42 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: "((((\"_ large decrease\") OR (\"c large decrease\"))) OR (\"c2 levels increased\"))~".
• Removing quotes may allow a broader search: (((( _ large decrease ) OR ( c large decrease ))) OR ( c2 levels increased ))~.
• Adding a wildcard symbol may retrieve word variants: (((("_ large decrease") OR ("c large decrease"))) OR ("c2 levels increased"))*.