Perhaps you should try some spelling variations:
"a largest decrease" » "a largest decreases" (Expand Search), "a marked decrease" (Expand Search), "_ largest decrease" (Expand Search), "a large decrease" (Expand Search), "a latest decrease" (Expand Search)
"a larger decrease" » "a marked decrease" (Expand Search), "a large decrease" (Expand Search), "_ larger decrease" (Expand Search), "_ large decrease" (Expand Search)
"i large decrease" » "i marked decrease" (Expand Search), "i large increases" (Expand Search), "i large degree" (Expand Search), "_ large decrease" (Expand Search), "a large decrease" (Expand Search), "via large decrease" (Expand Search)

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