Perhaps you should try some spelling variations:
"5 nn decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "5 non decrease" (Expand Search), "59 nn decrease" (Expand Search), "5 nm decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search)
"5 c decrease" » "5 c decreased" (Expand Search), "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "25 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: "((\"5 nn decrease\") OR (((\"5 c decrease\") OR (\"50 ng decrease\"))))~".
• Removing quotes may allow a broader search: (( 5 nn decrease ) OR ((( 5 c decrease ) OR ( 50 ng decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 nn decrease") OR ((("5 c decrease") OR ("50 ng decrease"))))*.