Systems and methods to identify values for a selected filter are described. The system receives a selection from a client machine. The selection identifies a filter that includes a first attribute-value pair that includes a first attribute and a first value, the first attribute-value pair being included in a concept query that was extracted from a query including at least one keyword that was received over the network from the client machine. The system further identifies filters responsive to receiving the selection, the identification of the filters being based on the first attribute and probabilities describing occurrences of attribute-value pairs in listings that respectively describe items that were previously transacted on a network-based marketplace, the filters including values. The system further generates a user interface including the values and search results that are identified based on the concept query and communicate the user interface to the client machine.