5. The method of claim 1 , wherein determining the secondary user intent for the first substring comprises: determining a confidence score for a plurality of interpretations of the first substring; and determining the secondary user intent for the first substring based on an interpretation of the plurality of interpretations of the first substring having the highest confidence score.
6. The method of claim 5 , wherein the plurality of interpretations of the first substring exclude interpretations from domains that do not output the first type of concept.