Perhaps you should try some spelling variations:
"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 mgn decrease" (Expand Search), "10 ngn decrease" (Expand Search), "5 ngn decrease" (Expand Search), "50 nsgn decrease" (Expand Search), "50 μgn decrease" (Expand Search), "50 _gn decrease" (Expand Search)
"50 mg_ decrease" » "50 _ decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 mg decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 nsg decrease" (Expand Search), "50 μg decrease" (Expand Search), "50 _g 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 μ 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 ng decrease"))) OR ("50 mg_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 ngn decrease\") OR (\"50 ng decrease\"))) OR (\"50 mg_ decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 ngn decrease ) OR ( 50 ng decrease ))) OR ( 50 mg_ decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 ngn decrease") OR ("50 ng decrease"))) OR ("50 mg_ decrease"))) OR ("50 n decrease"))*.