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