Perhaps you should try some spelling variations:
"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)
"10 nm decrease" » "10 nn decrease" (Expand Search), "10 _ decrease" (Expand Search), "10 we decrease" (Expand Search), "100 nm decrease" (Expand Search), "10 mm 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)

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: "((\"50 a decrease\") OR (((\"5 ng decrease\") OR (\"10 nm decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 a decrease ) OR ((( 5 ng decrease ) OR ( 10 nm decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 a decrease") OR ((("5 ng decrease") OR ("10 nm decrease"))))*.