Perhaps you should try some spelling variations:
"50 nss_ decrease" » "50 _ decrease" (Expand Search), "50 nsss_ decrease" (Expand Search), "50 ngss_ decrease" (Expand Search), "50 μss_ decrease" (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), "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 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 nn decrease") OR ("50 nss_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 nss_ decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 nss_ decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 nss_ decrease"))) OR ("50 n decrease"))*.