Perhaps you should try some spelling variations:
"a marker decrease" » "a marked decrease" (Expand Search), "a larger decrease" (Expand Search), "a marked increase" (Expand Search), "_ marker decrease" (Expand Search), "_ markers decrease" (Expand Search)
"a large decrease" » "a marked decrease" (Expand Search), "a large increases" (Expand Search), "a large degree" (Expand Search), "_ large decrease" (Expand Search)
"i large decrease" » "i marked decrease" (Expand Search), "i large increases" (Expand Search), "i large degree" (Expand Search), "_ large decrease" (Expand Search), "via large decrease" (Expand Search), "i larvae 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: (((("a large decrease") OR ("i large decrease"))) OR ("a marker decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a large decrease\") OR (\"i large decrease\"))) OR (\"a marker decrease\"))".
• Removing quotes may allow a broader search: (((( a large decrease ) OR ( i large decrease ))) OR ( a marker decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("a large decrease") OR ("i large decrease"))) OR ("a marker decrease"))*.