Perhaps you should try some spelling variations:
"_ nn decrease" » "_ _ decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg decrease" (Expand Search)
"5 we decrease" » "5 _ decrease" (Expand Search), "_ we decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "5 a decrease" (Expand Search), "50 i 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: (("_ nn decrease") OR ((("50 a decrease") OR ((("5 ng decrease") OR ("5 we decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"_ nn decrease\") OR (((\"50 a decrease\") OR (((\"5 ng decrease\") OR (\"5 we decrease\"))))))".
• Removing quotes may allow a broader search: (( _ nn decrease ) OR ((( 50 a decrease ) OR ((( 5 ng decrease ) OR ( 5 we decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("_ nn decrease") OR ((("50 a decrease") OR ((("5 ng decrease") OR ("5 we decrease"))))))*.