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