Perhaps you should try some spelling variations:
"50 nsg_ decrease" » "50 _ 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 nsg_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 nsg_ decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 nsg_ decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 nsg_ decrease"))) OR ("50 n decrease"))*.