sphinx returns less matches in comparison a sql like search

sphinx returns less matches in comparison a sql like search

im using Sphinx to make searchs in my web, but i have a thing, when i
search in phpmyadmin using
LIKE '%19.628%'
returns the data that im looking for (8 matches), but when i use the
sphinx returns less matches (3 matches) in comparison a sql LIKE search.
here the PHP code
$sp->SetMatchMode(SPH_MATCH_ANY);
$sp->SetArrayResult(true);
$sp->SetLimits(0,1000000);
$results = $sp->Query($query, 'data_base');
why?
regards