Perhaps you should try some spelling variations:
increase their » increase the (Expand search), increases the (Expand search), increased the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
the professors » the professor (Expand search), the professions (Expand search), of professors (Expand search)
decrease the » decreases the (Expand search), decrease of (Expand search)
decrease and » decreases and (Expand search), decrease of (Expand search), decrease _ (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain decrease (Expand search)

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

• Removing quotes may allow a broader search: (( increase their decrease the professors ) OR ( decrease and decrease in decrease ))~.