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 wt decrease" » "5 _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search), "2 wt decrease" (Expand Search)
"i wt decrease" » "i _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "i et decrease" (Expand Search), "2 wt decrease" (Expand Search)
"_ fe decrease" » "_ _ decrease" (Expand Search), "_ e 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 ((((("5 wt decrease") OR ("i wt decrease"))) OR ("_ fe decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ng decrease\") OR (((((\"5 wt decrease\") OR (\"i wt decrease\"))) OR (\"_ fe decrease\"))))*".
• Removing quotes may allow a broader search: (( 50 ng decrease ) OR ((((( 5 wt decrease ) OR ( i wt decrease ))) OR ( _ fe decrease ))))*.