Perhaps you should try some spelling variations:
"50 ng decrease" » "50 _ decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 μg decrease" (Expand Search)
"_ fe decrease" » "_ _ decrease" (Expand Search), "_ e decrease" (Expand Search)
"_ eb decrease" » "_ _ decrease" (Expand Search), "_ web decrease" (Expand Search), "_ ebv decrease" (Expand Search), "_ ebm 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 a decrease") OR ("50 ng decrease"))) OR ((("_ fe decrease") OR ("_ eb decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 a decrease\") OR (\"50 ng decrease\"))) OR (((\"_ fe decrease\") OR (\"_ eb decrease\"))))*".
• Removing quotes may allow a broader search: (((( 50 a decrease ) OR ( 50 ng decrease ))) OR ((( _ fe decrease ) OR ( _ eb decrease ))))*.