Perhaps you should try some spelling variations:
"50 nsggn decrease" » "50 nn decrease" (Expand Search), "50 nsggnn decrease" (Expand Search), "50 nsgg_ decrease" (Expand Search), "50 nsgga decrease" (Expand Search), "50 nssggn decrease" (Expand Search), "50 ngsggn decrease" (Expand Search), "50 μsggn decrease" (Expand Search)
"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 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 nsggn decrease") OR ("50 mean decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nsggn decrease\") OR (\"50 mean decrease\"))) OR (\"50 n decrease\"))*".
• Removing quotes may allow a broader search: (((( 50 nsggn decrease ) OR ( 50 mean decrease ))) OR ( 50 n decrease ))*.