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)
"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)
"b larger decrease" » "_ larger decrease" (Expand Search), "b large decrease" (Expand Search), "_ large decrease" (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 marked decrease\"))) OR (\"b larger decrease\"))~".
• Removing quotes may allow a broader search: (((( c large decrease ) OR ( a marked decrease ))) OR ( b larger decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("c large decrease") OR ("a marked decrease"))) OR ("b larger decrease"))*.