Perhaps you should try some spelling variations:
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg decrease" (Expand Search)
"2 wt decrease" » "2 _ decrease" (Expand Search), "i wt decrease" (Expand Search)
"_ wt decrease" » "_ _ decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 i decrease" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 n decrease\") OR (((\"5 ng decrease\") OR (((\"2 wt decrease\") OR (\"_ wt decrease\"))))))~".
• Removing quotes may allow a broader search: (( 50 n decrease ) OR ((( 5 ng decrease ) OR ((( 2 wt decrease ) OR ( _ wt decrease ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 n decrease") OR ((("5 ng decrease") OR ((("2 wt decrease") OR ("_ wt decrease"))))))*.