Perhaps you should try some spelling variations:
decrease treg » decrease the (Expand search), decrease their (Expand search)
treg decrease » the decrease (Expand search), urea decrease (Expand search), drugs decrease (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 19 » decrease in (Expand search), decrease of (Expand search), decrease _ (Expand search)
19 patterns » 1830 patterns (Expand search), and patterns (Expand search), age patterns (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: "(( decrease toc decrease toc decrease ) OR ( decrease treg decrease 19 patterns ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease toc decrease toc decrease ) OR ( decrease treg decrease 19 patterns ))*.