Perhaps you should try some spelling variations:
papers being » papers mining
10th world » 20th world, 18th world, 17th world
19th world » 18th world, 20th world, 4th world
being less » being lens, being leap, being left
less three » lesson three, lesser three, class three

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: "2008 ((10th world) OR (19th world)) papers being less three".
• Adding a wildcard symbol may retrieve word variants: 2008 ((10th world) OR (19th world)) papers being less three*.