Perhaps you should try some spelling variations:
their preprocessing » the preprocessing (Expand search), their processing (Expand search), the reprocessing (Expand search)
increase strain » increase grain (Expand search), increases brain (Expand search), increases grain (Expand search)
strain decrease » strains increases (Expand search), stress decreases (Expand search)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (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.

• Removing quotes may allow a broader search: (( increase strain decrease their preprocessing ) OR ( decrease and decrease NOT decrease ))~.