Perhaps you should try some spelling variations:
"i largest decrease" » "i largest decreases" (Expand Search), "i larger decrease" (Expand Search), "i marked decrease" (Expand Search), "_ largest decrease" (Expand Search), "a largest decrease" (Expand Search), "via largest decrease" (Expand Search)
"a marker increase" » "a marked increase" (Expand Search), "a marked increases" (Expand Search), "a larger increases" (Expand Search), "_ marker increase" (Expand Search), "_ markers increase" (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: (((("i largest decrease") OR ("i large decrease"))) OR ("a marker increase"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"i largest decrease\") OR (\"i large decrease\"))) OR (\"a marker increase\"))".
• Removing quotes may allow a broader search: (((( i largest decrease ) OR ( i large decrease ))) OR ( a marker increase )).
• Adding a wildcard symbol may retrieve word variants: (((("i largest decrease") OR ("i large decrease"))) OR ("a marker increase"))*.