Perhaps you should try some spelling variations:
"a marker decrease" » "a larger decrease" (Expand Search), "a markedly decreased" (Expand Search), "a marked increases" (Expand Search), "_ marker decrease" (Expand Search), "_ markers decrease" (Expand Search)
"n marked decrease" » "_ marked decrease" (Expand Search), "_ market decrease" (Expand Search), "_ marker decrease" (Expand Search)
"a marked increase" » "_ marked increase" (Expand Search), "a market increase" (Expand Search), "_ market increase" (Expand Search), "a marked increased" (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: "((((\"n marked decrease\") OR (\"a marked increase\"))) OR (\"a marker decrease\"))~".
• Removing quotes may allow a broader search: (((( n marked decrease ) OR ( a marked increase ))) OR ( a marker decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("n marked decrease") OR ("a marked increase"))) OR ("a marker decrease"))*.