Perhaps you should try some spelling variations:
"50 nsg decrease" » "50 use decreased" (Expand Search), "50 ash decreased" (Expand Search), "50 _ decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 nssg decrease" (Expand Search), "50 ngsg decrease" (Expand Search), "50 μsg decrease" (Expand Search)
"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 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 nn decrease") OR ((("50 n decrease") OR ("50 nsg decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nn decrease\") OR (((\"50 n decrease\") OR (\"50 nsg decrease\"))))".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((( 50 n decrease ) OR ( 50 nsg decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((("50 n decrease") OR ("50 nsg decrease"))))*.