Perhaps you should try some spelling variations:
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
in professors » and professors (Expand search), of professors (Expand search), _ professors (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), _ decrease (Expand search)

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

• Removing quotes may allow a broader search: (( decrease to decrease in professors ) OR ( decrease their decrease of decrease ))~.