Thinking Sphinx

Search criteria 1.Searching with the combination of the "AND" and "OR" conditions for four to five fields of the table.   -Added the indexes for the search fields.   Ex1. Order.search(:conditions=>["store_id=16 and (store_order_id='23432' or store_customer_id='23432')" ])     -This query is returning the empty result set.

  Ex2. Order.search(:conditions=>{:store_id=>16,:store_order_id=>"23432",:store_customer_id=>"23432"})     -This query works perfectly,but this is a combination of the "AND" condition.

Trying to find a solution to search on the multiple fields combined with "AND" and "OR" conditions.

Regards, Raghu