Perhaps you should try some spelling variations:
"50 ngn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 _ decrease" (Expand Search), "10 ngn decrease" (Expand Search), "5 ngn decrease" (Expand Search), "50 nsn decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 ns decrease" (Expand Search)
"50 mg decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search)
"50 μ decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "10 μ decrease" (Expand Search), "5 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 μ 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 μ decrease\"))".
• Removing quotes may allow a broader search: (((( 50 ngn decrease ) OR ((( 50 ng decrease ) OR ( 50 mg decrease ))))) OR ( 50 μ decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 ngn decrease") OR ((("50 ng decrease") OR ("50 mg decrease"))))) OR ("50 μ decrease"))*.