Perhaps you should try some spelling variations:
significant decrease » significant increase (Expand Search), significantly increased (Expand Search)
significant main » significant gap (Expand Search), significant amount (Expand Search), significant cause (Expand Search)
decrease cgas » increased cgas (Expand Search), increases cgas (Expand Search)
main decrease » gain decreased (Expand Search), mean decrease (Expand Search), small 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: "(( significant decrease cgas ) OR ( significant main decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( significant decrease cgas ) OR ( significant main decrease ))*.