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