Perhaps you should try some spelling variations:
decrease during » increase during (Expand search), increases during (Expand search), increased during (Expand search)
during decrease » during increased (Expand search), during depressed (Expand search), during disease (Expand search)
decrease fetal » decrease fear (Expand search), decrease renal (Expand search), decrease total (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
fetal objects » metal objects (Expand search), real objects (Expand search), focal objects (Expand search)
decrees that » devices that (Expand search), trees that (Expand search)
in decrease » in decreased (Expand search), on decrease (Expand search), pain 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 in decrease during decrease ) OR ( decrees that decrease fetal objects ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease in decrease during decrease ) OR ( decrees that decrease fetal objects ))*.