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)
"5 nm decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mm decrease" (Expand Search), "5 cm decrease" (Expand Search)
"50 c decrease" » "50 c decreased" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "5 c decrease" (Expand Search), "50 μ 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: (("50 nn decrease") OR ((("50 c decrease") OR ("5 nm decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nn decrease\") OR (((\"50 c decrease\") OR (\"5 nm decrease\"))))".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((( 50 c decrease ) OR ( 5 nm decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((("50 c decrease") OR ("5 nm decrease"))))*.