Perhaps you should try some spelling variations:
"5 nm decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mm decrease" (Expand Search), "5 cm decrease" (Expand Search)
"5 n_ decrease" » "5 _ decrease" (Expand Search), "5 nn decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 n decrease" (Expand Search), "5 ng decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (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: (((("5 nm decrease") OR ("5 n_ decrease"))) OR ((("50 a decrease") OR ("50 ng decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"5 nm decrease\") OR (\"5 n_ decrease\"))) OR (((\"50 a decrease\") OR (\"50 ng decrease\"))))".
• Removing quotes may allow a broader search: (((( 5 nm decrease ) OR ( 5 n_ decrease ))) OR ((( 50 a decrease ) OR ( 50 ng decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("5 nm decrease") OR ("5 n_ decrease"))) OR ((("50 a decrease") OR ("50 ng decrease"))))*.