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