Perhaps you should try some spelling variations:
"50 ngnn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ngnnn decrease" (Expand Search), "50 ngna decrease" (Expand Search), "50 ngn_ decreased" (Expand Search), "50 nsgnn decrease" (Expand Search), "50 nggnn decrease" (Expand Search), "50 μgnn decrease" (Expand Search)
"50 nga decrease" » "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 nsga decrease" (Expand Search), "50 ngga decrease" (Expand Search), "50 μga 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 ng 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 _ decrease") OR ("50 ngnn decrease"))) OR ("50 nga decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 _ decrease\") OR (\"50 ngnn decrease\"))) OR (\"50 nga decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 _ decrease ) OR ( 50 ngnn decrease ))) OR ( 50 nga decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 _ decrease") OR ("50 ngnn decrease"))) OR ("50 nga decrease"))) OR ("50 n decrease"))*.