Perhaps you should try some spelling variations:
"_ nn decrease" » "_ _ decrease" (Expand Search)
"5 wt decrease" » "5 _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search), "2 wt decrease" (Expand Search)
"19 a decrease" » "19 _ decrease" (Expand Search), "19 _ decreased" (Expand Search), "19 _ decreases" (Expand Search)
"1 a decrease" » "1 _ decrease" (Expand Search), "1 _ decreased" (Expand Search), "1 _ decreases" (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: "((\"_ nn decrease\") OR (((((\"19 a decrease\") OR (\"1 a decrease\"))) OR (\"5 wt decrease\"))))~".
• Removing quotes may allow a broader search: (( _ nn decrease ) OR ((((( 19 a decrease ) OR ( 1 a decrease ))) OR ( 5 wt decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("_ nn decrease") OR ((((("19 a decrease") OR ("1 a decrease"))) OR ("5 wt decrease"))))*.