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