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

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