Perhaps you should try some spelling variations:
length decision » lengthy decision, benth decision, health decision
decision free » decision tree, decision trees, decision frame
seven leagues » seven league, seventy leagues, seven plagues
robot length » root length, robot league, robot leg
world robot » word robot, world robert, world roots
world seven » world even, world server, world event
ilec world » apec world, file world, inc world
2008 linz » 2004 linz, 2018 linz, 2002 linz
2008 ilec » 2008 isecs, 2008 ieee, 2008 iet

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: (( ((2008 linz) OR (2009 linz)) world robot length decision free ) OR ( 2008 ilec world seven leagues vision based )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((2008 linz) OR (2009 linz)) world robot length decision free ) or ( 2008 ilec world seven leagues vision based ))".
• Adding a wildcard symbol may retrieve word variants: (( ((2008 linz) OR (2009 linz)) world robot length decision free ) or ( 2008 ilec world seven leagues vision based ))*.