Perhaps you should try some spelling variations:
"5 non decrease" » "5 _ decrease" (Expand Search), "5 no_ decrease" (Expand Search), "5 no_ decreased" (Expand Search), "5 no_ decreases" (Expand Search), "_ non decrease" (Expand Search), "a non decrease" (Expand Search), "b non decrease" (Expand Search), "15 non decrease" (Expand Search)
"_ nn decrease" » "_ _ decrease" (Expand Search), "_ n_ decrease" (Expand Search), "_ n_ decreased" (Expand Search), "_ n_ decreases" (Expand Search), "_ ann decrease" (Expand Search), "_ cnn decrease" (Expand Search), "_ knn decrease" (Expand Search)
"5 n decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search), "15 n decrease" (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: "((\"5 n decrease\") OR (((\"5 non decrease\") OR (\"_ nn decrease\"))))~".
• Removing quotes may allow a broader search: (( 5 n decrease ) OR ((( 5 non decrease ) OR ( _ nn decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 n decrease") OR ((("5 non decrease") OR ("_ nn decrease"))))*.