Perhaps you should try some spelling variations:
"50 ns decrease" » "50 _ decrease" (Expand Search)
"_ we decrease" » "_ _ decrease" (Expand Search), "_ w_ decrease" (Expand Search), "_ w_ decreased" (Expand Search), "_ w_ decreases" (Expand Search), "_ web decrease" (Expand Search), "_ fe decrease" (Expand Search), "_ wt decrease" (Expand Search)
"50 i decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 i decrease" (Expand Search), "5 i decrease" (Expand Search)
"_ e decrease" » "_ _ decrease" (Expand Search), "_ _ decreased" (Expand Search), "_ _ decreases" (Expand Search)

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