Perhaps you should try some spelling variations:
decrease separation » decrease cooperation (Expand search), decrease migration (Expand search), microphase separation (Expand search)
separation process » separation processes (Expand search)
decrease statins » disease statins (Expand search)
statins decrease » statins increase (Expand search), strains decrease (Expand search), skins decrease (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 NOT decrease NOT decrease ) OR ( decrease statins decrease separation process ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease NOT decrease NOT decrease ) OR ( decrease statins decrease separation process ))*.