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