Perhaps you should try some spelling variations:
"i largest decrease" » "i largest decreases" (Expand Search), "i larger decrease" (Expand Search), "_ largest decrease" (Expand Search), "i large decrease" (Expand Search)
"c marked decrease" » "c marked increase" (Expand Search), "_ marked decrease" (Expand Search), "a marked decrease" (Expand Search), "n marked decrease" (Expand Search)
"c levels increased" » "_ levels increased" (Expand Search), "1 levels increased" (Expand Search), "6 levels 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: "((((\"i largest decrease\") OR (\"c levels increased\"))) OR (\"c marked decrease\"))~".
• Removing quotes may allow a broader search: (((( i largest decrease ) OR ( c levels increased ))) OR ( c marked decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("i largest decrease") OR ("c levels increased"))) OR ("c marked decrease"))*.