Perhaps you should try some spelling variations:
significant increased » significant increase (Expand Search), significant increases (Expand Search), significantly increased (Expand Search)
increased crash » increased cgas (Expand Search), increased across (Expand Search), increased risk (Expand Search)
significant co » significant _ (Expand Search), significant i (Expand Search), significant gap (Expand Search)
co decrease » _ decrease (Expand Search), a decrease (Expand Search), nn 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 increased crash ) OR ( significant co decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( significant increased crash ) OR ( significant co decrease ))*.