Perhaps you should try some spelling variations:
semen processing » semantic processing (Expand search), soybean processing (Expand search), grain processing (Expand search)
decrease semen » decreased semen (Expand search), decrease human (Expand search), decrease need (Expand search)
decrease rate » decreased rate (Expand search), decreases rate (Expand search), decrease at (Expand search)
rate decrease » rats decreases (Expand search), rate increase (Expand search), to decrease (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can decrease » can increase (Expand search), and decrease (Expand search), to decrease (Expand search)

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

• Removing quotes may allow a broader search: (( decrease rate decrease semen processing ) OR ( decrease _ decrease can decrease ))~.