Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 n_ decrease" (Expand Search), "50 na decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search)
"50 nsggn decrease" » "50 nsgg_ decrease" (Expand Search), "50 nsgga decrease" (Expand Search), "50 nsgg_ decreased" (Expand Search), "50 nssggn decrease" (Expand Search), "50 ngsggn decrease" (Expand Search), "50 μsggn decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

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