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