Perhaps you should try some spelling variations:
"5 nn decrease" » "_ nn decrease" (Expand Search), "5 nn decreased" (Expand Search), "5 nn increase" (Expand Search)
"50 _ decrease" » "50 _ decreased" (Expand Search), "50 _ increase" (Expand Search)
"k nn decrease" » "k nn decreased" (Expand Search), "k nn increase" (Expand Search)
"a point decrease" » "a point decreased" (Expand Search), "a 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: "((\"50 _ decrease\") OR (((((\"5 nn decrease\") OR (\"k nn decrease\"))) OR (\"a point decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((((( 5 nn decrease ) OR ( k nn decrease ))) OR ( a point decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((((("5 nn decrease") OR ("k nn decrease"))) OR ("a point decrease"))))*.