Perhaps you should try some spelling variations:
"10 ng decrease" » "10 _ decrease" (Expand Search), "100 ng decrease" (Expand Search), "10 μg decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg decrease" (Expand Search)
"50 ns decrease" » "50 _ decrease" (Expand Search)
"5 a decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"10 ng decrease\") OR (((\"5 ng decrease\") OR (\"5 a decrease\"))))) OR (\"50 ns decrease\"))~".
• Removing quotes may allow a broader search: (((( 10 ng decrease ) OR ((( 5 ng decrease ) OR ( 5 a decrease ))))) OR ( 50 ns decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("10 ng decrease") OR ((("5 ng decrease") OR ("5 a decrease"))))) OR ("50 ns decrease"))*.