Perhaps you should try some spelling variations:
"a greatest decrease" » "a treatment decreased" (Expand Search), "a greater increase" (Expand Search), "a greater decrease" (Expand Search)
"a latest decrease" » "a largest decrease" (Expand Search), "a largest decreases" (Expand Search), "a latency decreased" (Expand Search), "a latent decrease" (Expand Search), "_ latest decrease" (Expand Search), "_ latent decrease" (Expand Search)
"b large decrease" » "b larger decrease" (Expand Search), "b marked decrease" (Expand Search), "b large increases" (Expand Search), "_ large decrease" (Expand Search), "a large decrease" (Expand Search), "_ larger 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 latest decrease") OR ("a greatest decrease"))) OR ("b large decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a latest decrease\") OR (\"a greatest decrease\"))) OR (\"b large decrease\"))".
• Removing quotes may allow a broader search: (((( a latest decrease ) OR ( a greatest decrease ))) OR ( b large decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("a latest decrease") OR ("a greatest decrease"))) OR ("b large decrease"))*.