Perhaps you should try some spelling variations:
"50 nggn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 nggnn decrease" (Expand Search), "50 ngg_ decreased" (Expand Search), "50 ngg_ decreases" (Expand Search), "50 nsggn decrease" (Expand Search), "50 ngggn decrease" (Expand Search), "50 μggn decrease" (Expand Search)
"50 a decrease" » "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search), "5 a decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (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 nggn decrease") OR ((("50 _ decrease") OR ("50 a decrease"))))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nggn decrease\") OR (((\"50 _ decrease\") OR (\"50 a decrease\"))))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nggn decrease ) OR ((( 50 _ decrease ) OR ( 50 a decrease ))))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nggn decrease") OR ((("50 _ decrease") OR ("50 a decrease"))))) OR ("50 n decrease"))*.