Perhaps you should try some spelling variations:
decrease their » decrease the (Expand search), increase their (Expand search), decreases the (Expand search)
their decrease » the decrease (Expand search), their disease (Expand search), the decreased (Expand search)
decrease angle » decrease age (Expand search), release angle (Expand search), decrease anxiety (Expand search)
decrease that » decrease the (Expand search), decrease at (Expand search), decrees that (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)
angle mapped » angle mapper (Expand search), angle mappers (Expand search), ngs mapped (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease their decrease that decrease ) OR ( decrease AND decrease angle mapped ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease their decrease that decrease ) OR ( decrease and decrease angle mapped ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease their decrease that decrease ) OR ( decrease and decrease angle mapped ))*.