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)
"5 we decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "_ we decrease" (Expand Search), "5 wt decrease" (Expand Search), "5 w decrease" (Expand Search)
"5 mg decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 mean decrease" (Expand Search), "5 mm decrease" (Expand Search)
"50 c decrease" » "50 c decreased" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "5 c decrease" (Expand Search), "50 μ decrease" (Expand Search)

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