Perhaps you should try some spelling variations:
"5 nn decrease" » "k nn decrease" (Expand Search), "_ nn decrease" (Expand Search), "5 nn decreased" (Expand Search), "5 nn increase" (Expand Search)
"15 n decrease" » "15 _ decrease" (Expand Search), "15 n decreased" (Expand Search), "15 n increase" (Expand Search)
"5 _ decrease" » "5 _ decreased" (Expand Search), "5 _ increase" (Expand Search)
"3d point decrease" » "3d point decreased" (Expand Search), "3d point increase" (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 nn decrease\") OR (\"5 _ decrease\"))) OR (((\"15 n decrease\") OR (\"3d point decrease\"))))~".
• Removing quotes may allow a broader search: (((( 5 nn decrease ) OR ( 5 _ decrease ))) OR ((( 15 n decrease ) OR ( 3d point decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("5 nn decrease") OR ("5 _ decrease"))) OR ((("15 n decrease") OR ("3d point decrease"))))*.