Perhaps you should try some spelling variations:
with professors » with professor (Expand search), the professors (Expand search), with professionals (Expand search)
rats decreases » and decreases (Expand search), but decreases (Expand search), stress decreases (Expand search)
decreases with » increases with (Expand search), decreases in (Expand search)
decrease rats » decreased rate (Expand search), decreases rate (Expand search), decrease its (Expand search)
decrease at » decrease and (Expand search), decrease in (Expand search), decrease of (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and decrease (Expand search)
decrease il » decreased il (Expand search), decrease in (Expand search), decrease hiv (Expand search)
il decrease » l decrease (Expand search), will decrease (Expand search), oil decreases (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 rats decreases with professors ) OR ( decrease at decrease il decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease rats decreases with professors ) OR ( decrease at decrease il decrease ))*.