A computer-implemented method is disclosed. A search query of a text transcription is received. The search query includes a word or words having a specified spelling. A sequence of search phonemes corresponding to the specified spelling is generated. A sequence of transcript phonemes corresponding to the text transcription is generated from the text transcription. A search alignment in which the sequence of search phonemes is aligned to a transcript phoneme fragment is generated. Based at least on the search alignment having a quality score exceeding a quality score threshold, the transcript phoneme fragment and an associated portion of the text transcription is determined to result from an utterance of the specified spelling in an audio session corresponding to the text transcription. A search result indicating that the transcript phoneme fragment and the associated portion of the text transcription is determined to have resulted from the utterance is output.