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 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search), "50 _n 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 ngs decrease" (Expand Search), "50 μs decrease" (Expand Search), "50 _s decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 ns decrease\"))) OR (((\"50 n decrease\") OR (\"5 ng decrease\"))))~".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 ns decrease ))) OR ((( 50 n decrease ) OR ( 5 ng decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 ns decrease"))) OR ((("50 n decrease") OR ("5 ng decrease"))))*.