Perhaps you should try some spelling variations:
"50 nsg_ decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 nssg_ decrease" (Expand Search), "50 ngsg_ decrease" (Expand Search), "50 μsg_ decrease" (Expand Search)
"50 ngn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 ngnn decrease" (Expand Search), "50 ng_ decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 nsgn decrease" (Expand Search), "50 nggn decrease" (Expand Search), "50 μgn 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 ngn decrease") OR ("50 nsg_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 ngn decrease\") OR (\"50 nsg_ decrease\"))) OR (\"50 n decrease\"))*".
• Removing quotes may allow a broader search: (((( 50 ngn decrease ) OR ( 50 nsg_ decrease ))) OR ( 50 n decrease ))*.