return me the paper after 2000 in VLDB conference with the most citations .
SELECT t2.title FROM publication AS t2 JOIN conference AS t1 ON t2.cid  =  t1.cid WHERE t1.name  =  "VLDB" AND t2.year  >  2000 ORDER BY t2.citation_num DESC LIMIT 1;
SELECT t2.title FROM publication AS t2 JOIN conference AS t1 ON t2.cid  =  t1.cid WHERE t1.name  =  "VLDB" AND t2.year  >  2000 ORDER BY t2.citation_num DESC LIMIT 1;
[{'Nenhum': 'Nenhum resultado encontrado'}]