Perhaps you should try some spelling variations:
"50 cssn decrease" » "50 cost decreased" (Expand Search), "50 mean decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 cssnn decrease" (Expand Search), "50 cssa decrease" (Expand Search), "50 css_ decreased" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we 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 cg 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 μ decrease" (Expand Search), "50 c decrease" (Expand Search)

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