strange searching result

[Mazinger]

Try searching for "condition posts 0" ...

you'll get an error message like that:
The search term you specified (0) is under the minimum word length (4) and therefore will not be found. Please make this term longer.

If this term contains a wildcard, please make this term more specific.
???

[---MAD---]

Yeah I reported this a bug.

[Wayne Luke]

It isn't a bug... Don't search for '0'. It isn't indexed.

[Mazinger]

it's not just the '0', any number will do the same result.

[Wayne Luke]

Numbers aren't indexed. Only words with 4 or more characters are indexed.