Perhaps you should try some spelling variations:
"1_ a decrease" » "_ a decrease" (Expand Search), "19 a decrease" (Expand Search), "1_ a decreased" (Expand Search), "1_ a increase" (Expand Search)
"1 a decrease" » "19 a decrease" (Expand Search), "1 a decreased" (Expand Search), "1 a increase" (Expand Search)
"50 _ decrease" » "50 _ decreased" (Expand Search), "50 _ increase" (Expand Search)
"100 nm decrease" » "100 nm decreased" (Expand Search), "100 nm increase" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 _ decrease\") OR (((\"100 nm decrease\") OR (((\"1_ a decrease\") OR (\"1 a decrease\"))))))~".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((( 100 nm decrease ) OR ((( 1_ a decrease ) OR ( 1 a decrease ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((("100 nm decrease") OR ((("1_ a decrease") OR ("1 a decrease"))))))*.