Perhaps you should try some spelling variations:
"50 ng decrease" » "50 _ decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 μg decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg decrease" (Expand Search)
"5 we decrease" » "5 _ decrease" (Expand Search), "_ we decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "5 a decrease" (Expand Search), "50 i decrease" (Expand Search)

You may be able to get more results by adjusting your search query.

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