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)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("5 a decrease") OR ((("5 n decrease") OR ((("5 nmon decrease") OR ("5 mean decrease"))))))~.
• 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"))))))*.