Perhaps you should try some spelling variations:
"50 mean decrease" » "50 a decrease" (Expand Search), "50 meann decrease" (Expand Search), "50 mea_ decrease" (Expand Search), "50 meaa decrease" (Expand Search), "20 means decrease" (Expand Search)
"50 nsn decrease" » "50 nn decrease" (Expand Search), "50 use decreased" (Expand Search), "50 ash decreased" (Expand Search), "50 nsnn decrease" (Expand Search), "50 ns_ decrease" (Expand Search), "50 nsa decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 nssn decrease" (Expand Search), "50 ngsn decrease" (Expand Search), "50 μsn decrease" (Expand Search)
"50 na decrease" » "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 pa decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "40 na decrease" (Expand Search), "50 nsa decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 μa decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("50 na decrease") OR ("50 mean decrease"))) OR ("50 nsn decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 na decrease\") OR (\"50 mean decrease\"))) OR (\"50 nsn decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 na decrease ) OR ( 50 mean decrease ))) OR ( 50 nsn decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 na decrease") OR ("50 mean decrease"))) OR ("50 nsn decrease"))) OR ("50 n decrease"))*.