Perhaps you should try some spelling variations:
"50 _sn decrease" » "50 _ decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 use decreased" (Expand Search), "50 _s_ decrease" (Expand Search), "50 _sa decrease" (Expand Search), "50 _s_ decreased" (Expand Search)
"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), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 μn decrease" (Expand Search), "50 _n decrease" (Expand Search)
"50 ng decrease" » "50 _ 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 _g decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 μ decrease" (Expand Search)

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You may be able to get more results by adjusting your search query.

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