Actually 01 - 09 are blocked when you use them as search terms, but not as words in a filename. Most prepositions, conjunctions and pronouns are in the same category. What's weird is that these all work: 

00 
10 
66 
007 
000930 

The filter is breaking down big-time right now because what it excludes seems to defy logic. Also these words can't be searched or found(?): 

BLACK 
DA 
FIRE 
GHOST 
JACKSON 
JOHN 
OLD 
REMIX 
ROCK 
STAR 
TALKING
BURN
WILL
HILL
A
TRAIN

©?underground control talking stones black cruel ghost remix young fire rock soul star hot old two da #s