Perhaps you should try some spelling variations:
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 ns decrease" (Expand Search)
"10 ng decrease" » "10 nn decrease" (Expand Search), "10 a decrease" (Expand Search), "10 we decrease" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"69 0 decrease" » "69 a decrease" (Expand Search), "69 _ decreased" (Expand Search), "69 _ decreases" (Expand Search), "6 0 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 _ decrease") OR ((("69 0 decrease") OR ((("50 ng decrease") OR ("10 ng decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 _ decrease\") OR (((\"69 0 decrease\") OR (((\"50 ng decrease\") OR (\"10 ng decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((( 69 0 decrease ) OR ((( 50 ng decrease ) OR ( 10 ng decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((("69 0 decrease") OR ((("50 ng decrease") OR ("10 ng decrease"))))))*.