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 n decrease" (Expand Search), "59 nn decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 ns decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"5 we decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "_ we decrease" (Expand Search), "5 wt decrease" (Expand Search), "5 w decrease" (Expand Search)

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