Perhaps you should try some spelling variations:
"c marked decrease" » "c marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked decrease" (Expand Search)
"c large decrease" » "c large increases" (Expand Search), "c large degree" (Expand Search), "_ large decrease" (Expand Search), "a large decrease" (Expand Search), "b large decrease" (Expand Search)
"c larger decrease" » "_ larger decrease" (Expand Search), "_ large decrease" (Expand Search), "a large decrease" (Expand Search), "a larger decrease" (Expand Search), "b larger decrease" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("c marked decrease") OR ("c large decrease"))) OR ("c larger decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"c marked decrease\") OR (\"c large decrease\"))) OR (\"c larger decrease\"))".
• Removing quotes may allow a broader search: (((( c marked decrease ) OR ( c large decrease ))) OR ( c larger decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("c marked decrease") OR ("c large decrease"))) OR ("c larger decrease"))*.