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