Perhaps you should try some spelling variations:
"50 _nn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _nnn decrease" (Expand Search), "50 _na decrease" (Expand Search), "50 _n_ decreased" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 nsg decrease" (Expand Search), "50 μg decrease" (Expand Search), "50 cg decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (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 _nn decrease") OR ("50 ng decrease"))) OR ((("50 n decrease") OR ("50 _ decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 _nn decrease\") OR (\"50 ng decrease\"))) OR (((\"50 n decrease\") OR (\"50 _ decrease\"))))".
• Removing quotes may allow a broader search: (((( 50 _nn decrease ) OR ( 50 ng decrease ))) OR ((( 50 n decrease ) OR ( 50 _ decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("50 _nn decrease") OR ("50 ng decrease"))) OR ((("50 n decrease") OR ("50 _ decrease"))))*.