Perhaps you should try some spelling variations:
"b largest decrease" » "b largest decreases" (Expand Search), "b larger decrease" (Expand Search), "_ largest decrease" (Expand Search), "b 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 age increased" » "c rate increased" (Expand Search), "c use increased" (Expand Search), "c large increases" (Expand Search), "_ age increased" (Expand Search), "g age increased" (Expand Search), "9 age increased" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("b largest decrease") OR ((("c marked decrease") OR ("c age increased"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"b largest decrease\") OR (((\"c marked decrease\") OR (\"c age increased\"))))".
• Removing quotes may allow a broader search: (( b largest decrease ) OR ((( c marked decrease ) OR ( c age increased )))).
• Adding a wildcard symbol may retrieve word variants: (("b largest decrease") OR ((("c marked decrease") OR ("c age increased"))))*.