Perhaps you should try some spelling variations:
"50 n_ decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 ns_ decrease" (Expand Search), "50 ng_ decrease" (Expand Search), "50 μ_ decrease" (Expand Search)
"50 _g decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 ng decrease" (Expand Search), "50 μg decrease" (Expand Search)
"50 mg decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (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 n_ decrease") OR ((("50 _g decrease") OR ("50 mg decrease"))))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 n_ decrease\") OR (((\"50 _g decrease\") OR (\"50 mg decrease\"))))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 n_ decrease ) OR ((( 50 _g decrease ) OR ( 50 mg decrease ))))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 n_ decrease") OR ((("50 _g decrease") OR ("50 mg decrease"))))) OR ("50 n decrease"))*.