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

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