Perhaps you should try some spelling variations:
"5 non decrease" » "5 point decrease" (Expand Search), "5 note decreased" (Expand Search), "5 fold decrease" (Expand Search), "_ non decrease" (Expand Search), "a non decrease" (Expand Search), "e non decrease" (Expand Search)
"5 nn decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "59 nn decrease" (Expand Search), "5 nm decrease" (Expand Search), "5 n decrease" (Expand Search)
"50 ns decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 ms decrease" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("5 nn decrease") OR ("5 non decrease"))) OR ("50 ns decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"5 nn decrease\") OR (\"5 non decrease\"))) OR (\"50 ns decrease\"))".
• Removing quotes may allow a broader search: (((( 5 nn decrease ) OR ( 5 non decrease ))) OR ( 50 ns decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("5 nn decrease") OR ("5 non decrease"))) OR ("50 ns decrease"))*.