Perhaps you should try some spelling variations:
"10 ng decrease" » "10 nn decrease" (Expand Search), "10 a decrease" (Expand Search), "10 we decrease" (Expand Search), "10 na decrease" (Expand Search), "10 ngy decreased" (Expand Search), "10 n_ decreased" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"5 ng decrease" » "5 nn decrease" (Expand Search), "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 na decrease" (Expand Search), "5 ngy decreased" (Expand Search), "5 n_ decreased" (Expand Search), "5 mg decrease" (Expand Search), "5 nm decrease" (Expand Search), "5 kg decrease" (Expand Search)
"5 g decrease" » "5 a decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 _ decreased" (Expand Search), "5 mg decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("50 _ decrease") OR ((("10 ng decrease") OR ((("5 ng decrease") OR ("5 g decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 _ decrease\") OR (((\"10 ng decrease\") OR (((\"5 ng decrease\") OR (\"5 g decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((( 10 ng decrease ) OR ((( 5 ng decrease ) OR ( 5 g decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((("10 ng decrease") OR ((("5 ng decrease") OR ("5 g decrease"))))))*.