Perhaps you should try some spelling variations:
decreases processes » decrease processes (Expand search)
disease decreases » diseases decreases (Expand search), disease increases (Expand search), distance decreases (Expand search)
decrease toxic » decrease toc (Expand search), decrease their (Expand search), decrease total (Expand search)
toxic effluent » toxic effect (Expand search), pox effluent (Expand search), to effluent (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease _ disease decreases processes ) OR ( decrease to decrease toxic effluent ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease _ disease decreases processes ) OR ( decrease to decrease toxic effluent ))*.