How does the drupall search work, in terms of how it does a database search?

I'm wondering if anybody know how the drupal search works in terms of how it joins strings during a search, it seems that it only searches for explicit strings (and) and not individual strings within a sentence for example (or).

For example if I have a node with a string of text. "Children love to play at the park".

Then if I search for the string " I love to play in the park"...that node should come up right? because there's a matching string of "park".

I'm not expecting drupal search to work like google, but i'm hoping that I might have messed something up or there's a way to tweak this.

Thanks for any help and info.