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)
"50 ng decrease" » "50 ng decreased" (Expand Search), "50 ng increase" (Expand Search)
"_ ann decrease" » "_ ann decreased" (Expand Search), "_ ann increase" (Expand Search), "_ anna decrease" (Expand Search)
"_ e decrease" » "_ e decreased" (Expand Search), "_ e 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 ng decrease\") OR (((((\"5 nn decrease\") OR (\"_ ann decrease\"))) OR (\"_ e decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 ng decrease ) OR ((((( 5 nn decrease ) OR ( _ ann decrease ))) OR ( _ e decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 ng decrease") OR ((((("5 nn decrease") OR ("_ ann decrease"))) OR ("_ e decrease"))))*.