Perhaps you should try some spelling variations:
"50 ngn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ngnn decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 ng_ decreased" (Expand Search), "50 ng decrease" (Expand Search), "50 nsgn decrease" (Expand Search), "50 nggn decrease" (Expand Search), "50 cgn decrease" (Expand Search)
"50 μ decrease" » "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 μ decrease" (Expand Search), "5 μ decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 c decrease" (Expand Search)

Try widening your search to All Fields.

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