Perhaps you should try some spelling variations:
"5 a decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search)
"5 n decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search), "15 n decrease" (Expand Search)
"5 nmon decrease" » "5 nmo_ decrease" (Expand Search), "5 nmo_ decreased" (Expand Search), "5 nmo_ decreases" (Expand Search), "15 nmon decrease" (Expand Search), "5 non decrease" (Expand Search), "5 nmol decrease" (Expand Search), "5 mon decrease" (Expand Search)
"5 mean decrease" » "5 mea_ decrease" (Expand Search), "5 mea_ decreased" (Expand Search), "5 mea_ decreases" (Expand Search), "_ mean decrease" (Expand Search), "a mean decrease" (Expand Search), "c mean 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 a decrease\") OR (((\"5 n decrease\") OR (((\"5 nmon decrease\") OR (\"5 mean decrease\"))))))~".
• Removing quotes may allow a broader search: (( 5 a decrease ) OR ((( 5 n decrease ) OR ((( 5 nmon decrease ) OR ( 5 mean decrease ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 a decrease") OR ((("5 n decrease") OR ((("5 nmon decrease") OR ("5 mean decrease"))))))*.