Perhaps you should try some spelling variations:
"19 means decrease" » "19 mean decrease" (Expand Search), "19 deaths decreased" (Expand Search), "19 mea_ decrease" (Expand Search), "19 meaa decrease" (Expand Search), "19 meawe decrease" (Expand Search), "1 means decrease" (Expand Search), "_ means decrease" (Expand Search), "k means decrease" (Expand Search)
"50 ns decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 ms decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search), "59 nn decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("50 ns decrease") OR ((("50 nn decrease") OR ("19 means decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ns decrease\") OR (((\"50 nn decrease\") OR (\"19 means decrease\"))))".
• Removing quotes may allow a broader search: (( 50 ns decrease ) OR ((( 50 nn decrease ) OR ( 19 means decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 ns decrease") OR ((("50 nn decrease") OR ("19 means decrease"))))*.