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