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