Perhaps you should try some spelling variations:
"50 μ decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 μ decrease" (Expand Search), "5 μ decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "5 a decrease" (Expand Search), "0 a decrease" (Expand Search)
"50 c decrease" » "50 c decreased" (Expand Search), "50 _ decrease" (Expand Search), "50 rc decreased" (Expand Search), "20 c decrease" (Expand Search), "30 c decrease" (Expand Search)
"5 c decrease" » "5 c decreased" (Expand Search), "5 _ decrease" (Expand Search), "5 rc decreased" (Expand Search), "25 c 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 a decrease") OR ((("50 μ decrease") OR ((("50 c decrease") OR ("5 c decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 a decrease\") OR (((\"50 μ decrease\") OR (((\"50 c decrease\") OR (\"5 c decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 a decrease ) OR ((( 50 μ decrease ) OR ((( 50 c decrease ) OR ( 5 c decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 a decrease") OR ((("50 μ decrease") OR ((("50 c decrease") OR ("5 c decrease"))))))*.