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 nm decrease" (Expand Search)
"50 ns decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 we decrease" (Expand Search), "50 ms decrease" (Expand Search), "50 ngs decrease" (Expand Search), "50 μs decrease" (Expand Search), "50 _s decrease" (Expand Search)
"5 a decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

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