Perhaps you should try some spelling variations:
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 kg decrease" (Expand Search)
"5 nm decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mm decrease" (Expand Search), "5 cm decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search)

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