Perhaps you should try some spelling variations:
decreased sperm » decreased sleep (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their projects » the projects (Expand search), their products (Expand search), thematic projects (Expand search)
or decreased » or decrease (Expand search), of decreased (Expand search), or decreases (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease or » decrease of (Expand search), decrease pro (Expand search), decrease in (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease OR decreased sperm decrease ) OR ( decrease toc decrease their projects ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease or decreased sperm decrease ) OR ( decrease toc decrease their projects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease or decreased sperm decrease ) OR ( decrease toc decrease their projects ))*.