Perhaps you should try some spelling variations:
length decision » lengthy decision, benth decision, health decision
decision free » decision tree, decision trees, decision frame
world seven » world server, world event, world sees
link world » blinky world, blind world, link words
world root » world robot, world roots, world boot
world even » world event, world events
2008 link » 2008 ink, 2008 linq, 2008 linz
2008 iet » 2008 ieee

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