Perhaps you should try some spelling variations:
"5 ng decrease" » "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 kg decrease" (Expand Search)
"5 nm decrease" » "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mm decrease" (Expand Search), "5 cm decrease" (Expand Search)
"50 nn decrease" » "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n 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 _ decrease\") OR (((((\"5 ng decrease\") OR (\"5 nm decrease\"))) OR (\"50 nn decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((((( 5 ng decrease ) OR ( 5 nm decrease ))) OR ( 50 nn decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((((("5 ng decrease") OR ("5 nm decrease"))) OR ("50 nn decrease"))))*.