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