Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"50 _n decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 n decrease" (Expand Search)
"10 ng decrease" » "10 _ decrease" (Expand Search), "10 a decrease" (Expand Search), "10 gy decreased" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"50 we decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 nn decrease") OR ("50 _n decrease"))) OR ((("10 ng decrease") OR ("50 we decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 _n decrease\"))) OR (((\"10 ng decrease\") OR (\"50 we decrease\"))))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 _n decrease ))) OR ((( 10 ng decrease ) OR ( 50 we decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 _n decrease"))) OR ((("10 ng decrease") OR ("50 we decrease"))))*.