Perhaps you should try some spelling variations:
decrease rectal » decreases rectal (Expand search), decrease fetal (Expand search), decrease renal (Expand search)
decrease with » decreases with (Expand search), increase with (Expand search), decrease in (Expand search)
with decrease » with decreased (Expand search), with deceased (Expand search), with increase (Expand search)
rectal artery » renal artery (Expand search), retinal artery (Expand search), rectal surgery (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease with decrease toc decrease ) OR ( decrease AND decrease rectal artery ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease with decrease toc decrease ) OR ( decrease and decrease rectal artery ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease with decrease toc decrease ) OR ( decrease and decrease rectal artery ))*.