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.>["store_id=16 and
(store_order_id='23432' or store_customer_id='23432')" ])
    -This query is returning the empty result set.

    -This query works perfectly,but this is a combination of the "AND"

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