[YouTube-API] Playlist Keyword Query

I'm having a lot of trouble properly utilizing the keyword query for
YouTube playlists. I've tried using both the Zend Gdata framework and
the REST API, with and without providing my API key. I always seem to
get a much smaller result set than what conventional YouTube web-based
search provides. I am of course incrementing the start-index and
calling getNextFeed in Zend. Is it the case that the keyword search
only returns recent playlists? If so, is there a way around this? Or
maybe is the keyword query not searching the titles/descriptions of
the playlists and are in stead searching categories or some other
metadata?

REST returns less than 90 results
http://gdata.youtube.com/feeds/api/playlists/snippets?q=Let's+Play&key=AI39si52rhsvMX3iP4PUZ1PUfPIA-whAnbi5vFLUlUSMKVm5RxvoiYWgczzX4DGUExp_HIrPu2ul2gqycnRPMcwqtMehM_1P4Q&v=2&safesearch=none&start-index=80&max-results=50

YouTube search returns several hundred thousand results
http://www.youtube.com/results?search_query=Let's+Play,+playlist&search_type=&aq=f

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