Perhaps you should try some spelling variations:
"50 n_ decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 ns_ decrease" (Expand Search), "50 ng_ decrease" (Expand Search), "50 μ_ decrease" (Expand Search)
"50 na decrease" » "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 pa decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "40 na decrease" (Expand Search), "50 nsa decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 μa decrease" (Expand Search)
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ns decrease" (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 n_ decrease") OR ("50 na decrease"))) OR ((("50 n decrease") OR ("5 ng decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 n_ decrease\") OR (\"50 na decrease\"))) OR (((\"50 n decrease\") OR (\"5 ng decrease\"))))*".
• Removing quotes may allow a broader search: (((( 50 n_ decrease ) OR ( 50 na decrease ))) OR ((( 50 n decrease ) OR ( 5 ng decrease ))))*.