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 n_ decrease" (Expand Search), "50 na decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search)
"50 μggn decrease" » "50 μgg_ decrease" (Expand Search), "50 μgga decrease" (Expand Search), "50 μgg_ decreased" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (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: (("50 μggn decrease") OR ((("50 n decrease") OR ("50 nn decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 μggn decrease\") OR (((\"50 n decrease\") OR (\"50 nn decrease\"))))".
• Removing quotes may allow a broader search: (( 50 μggn decrease ) OR ((( 50 n decrease ) OR ( 50 nn decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 μggn decrease") OR ((("50 n decrease") OR ("50 nn decrease"))))*.