Perhaps you should try some spelling variations:
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a 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)
"5 we decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 nn decrease" (Expand Search), "_ we decrease" (Expand Search), "5 w decrease" (Expand Search), "5 e decrease" (Expand Search)
"5 wt decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 nn decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 μ decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 n decrease") OR ("50 ng decrease"))) OR ((("5 we decrease") OR ("5 wt decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 n decrease\") OR (\"50 ng decrease\"))) OR (((\"5 we decrease\") OR (\"5 wt decrease\"))))".
• Removing quotes may allow a broader search: (((( 50 n decrease ) OR ( 50 ng decrease ))) OR ((( 5 we decrease ) OR ( 5 wt decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("50 n decrease") OR ("50 ng decrease"))) OR ((("5 we decrease") OR ("5 wt decrease"))))*.