Perhaps you should try some spelling variations:
"_ non decrease" » "_ _ decrease" (Expand Search)
"_ nn decrease" » "_ _ decrease" (Expand Search), "_ ann decrease" (Expand Search), "_ cnn decrease" (Expand Search), "_ knn decrease" (Expand Search)
"5 a decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search)
"3 fold decrease" » "_ fold decrease" (Expand Search), "5 fold decrease" (Expand Search), "k fold 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: "((\"5 a decrease\") OR (((((\"_ nn decrease\") OR (\"3 fold decrease\"))) OR (\"_ non decrease\"))))~".
• Removing quotes may allow a broader search: (( 5 a decrease ) OR ((((( _ nn decrease ) OR ( 3 fold decrease ))) OR ( _ non decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 a decrease") OR ((((("_ nn decrease") OR ("3 fold decrease"))) OR ("_ non decrease"))))*.