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 ng decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search), "5 kg decrease" (Expand Search)
"5 mg decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "5 mm decrease" (Expand Search)
"50 we decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search)

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