Perhaps you should try some spelling variations:
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm decrease" (Expand Search)
"10 nm decrease" » "10 nn decrease" (Expand Search), "10 _ decrease" (Expand Search), "10 we decrease" (Expand Search), "100 nm decrease" (Expand Search), "10 mm 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 ng decrease") OR ("50 a decrease"))) OR ("10 nm decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"5 ng decrease\") OR (\"50 a decrease\"))) OR (\"10 nm decrease\"))".
• Removing quotes may allow a broader search: (((( 5 ng decrease ) OR ( 50 a decrease ))) OR ( 10 nm decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("5 ng decrease") OR ("50 a decrease"))) OR ("10 nm decrease"))*.