Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"10 ng decrease" » "10 _ decrease" (Expand Search), "10 a decrease" (Expand Search), "10 we decrease" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"5 wt decrease" » "5 we decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht 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 nn decrease\") OR (((\"10 ng decrease\") OR (\"5 wt decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((( 10 ng decrease ) OR ( 5 wt decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((("10 ng decrease") OR ("5 wt decrease"))))*.