I am very new to YQL/REST. I am trying to query multiple symbols for monthly options data. At this point, only the first symbol is recognized. Do I need an expiration date for each symbol? 

Part of the query is below.
yahoo.finance.options%20WHERE%20symbol%20in%20(%22YHOO%2CSNDK%22)%20AND%20expiration%3D'2012-01'

While I can query a single symbol, after about a dozen symbols x 14 expiration queries/ symbol, I get page load failures. It appears I am limited to how many page requests I can send before YQL 'tires out'.

Thanks,
-Doug