Perhaps you should try some spelling variations:
"50 nggn decrease" » "50 mean decrease" (Expand Search), "50 ngg_ decrease" (Expand Search), "50 ngga decrease" (Expand Search), "50 ngg_ decreased" (Expand Search), "50 nsggn decrease" (Expand Search), "50 ngggn decrease" (Expand Search), "50 μggn decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 n_ decrease" (Expand Search), "50 na decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ 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: (("50 nggn decrease") OR ((("50 n decrease") OR ("50 nn decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nggn decrease\") OR (((\"50 n decrease\") OR (\"50 nn decrease\"))))".
• Removing quotes may allow a broader search: (( 50 nggn decrease ) OR ((( 50 n decrease ) OR ( 50 nn decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 nggn decrease") OR ((("50 n decrease") OR ("50 nn decrease"))))*.