Perhaps you should try some spelling variations:
seven leagues » seventy leagues, seven plagues, seven lectures
seven league » seventy leagues, solemn league, seven lecture
visual based » visual basic
linz world » blind world, online world, linear world
2008 ieee » 2018 ieee, 2009 ieee
tree » true

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: (( 2009 linz world new health decision tree ) OR ( 2008 ieee world ((seven league) OR (seven leagues)) visual based )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 2009 linz world new health decision tree ) or ( 2008 ieee world ((seven league) OR (seven leagues)) visual based ))".
• Adding a wildcard symbol may retrieve word variants: (( 2009 linz world new health decision tree ) or ( 2008 ieee world ((seven league) OR (seven leagues)) visual based ))*.