Perhaps you should try some spelling variations:
"i largest decrease" » "i largest decreases" (Expand Search), "i larger decrease" (Expand Search), "i marked decrease" (Expand Search), "_ largest decrease" (Expand Search), "i large decrease" (Expand Search)
"i values decrease" » "i values increased" (Expand Search), "_ values decrease" (Expand Search)
"c2 cases increased" » "c2 rate increased" (Expand Search), "c2 levels increased" (Expand Search), "152 cases increased" (Expand Search), "chd cases increased" (Expand Search), "123 cases increased" (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: (((("i values decrease") OR ("c2 cases increased"))) OR ("i largest decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"i values decrease\") OR (\"c2 cases increased\"))) OR (\"i largest decrease\"))".
• Removing quotes may allow a broader search: (((( i values decrease ) OR ( c2 cases increased ))) OR ( i largest decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("i values decrease") OR ("c2 cases increased"))) OR ("i largest decrease"))*.