Perhaps you should try some spelling variations:
"50 _n decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _nn decrease" (Expand Search), "50 __ decrease" (Expand Search), "50 _a decrease" (Expand Search)
"50 ns decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ms decrease" (Expand Search), "50 ngs decrease" (Expand Search), "50 μs decrease" (Expand Search), "50 _s decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a 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 _n decrease") OR ("50 n decrease"))) OR ("50 ns decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 _n decrease\") OR (\"50 n decrease\"))) OR (\"50 ns decrease\"))".
• Removing quotes may allow a broader search: (((( 50 _n decrease ) OR ( 50 n decrease ))) OR ( 50 ns decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 _n decrease") OR ("50 n decrease"))) OR ("50 ns decrease"))*.