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

Try widening your search to All Fields.

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

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