Perhaps you should try some spelling variations:
"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)
"6 nm decrease" » "6 _ 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: (((((("5 ng decrease") OR ("5 we decrease"))) OR ("6 nm decrease"))) OR ("50 a decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"5 ng decrease\") OR (\"5 we decrease\"))) OR (\"6 nm decrease\"))) OR (\"50 a decrease\"))*".
• Removing quotes may allow a broader search: (((((( 5 ng decrease ) OR ( 5 we decrease ))) OR ( 6 nm decrease ))) OR ( 50 a decrease ))*.