Perhaps you should try some spelling variations:
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 we decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 ns decrease" (Expand Search)
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"50 mg decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 we decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ 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 ng decrease") OR ("50 mg decrease"))) OR ("5 ng decrease"))) OR ("50 a decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 ng decrease\") OR (\"50 mg decrease\"))) OR (\"5 ng decrease\"))) OR (\"50 a decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 ng decrease ) OR ( 50 mg decrease ))) OR ( 5 ng decrease ))) OR ( 50 a decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 ng decrease") OR ("50 mg decrease"))) OR ("5 ng decrease"))) OR ("50 a decrease"))*.