If you want to search any part of the video series simply open the search bar by clicking on the search glass in the top right hand corner of the first video and put a word in the search bar. You can scroll through and read the transcripts or go to the section by clicking on the little dots at the bottom of the play bar and then clicking the play button to listen in. You can choose any of the videos/files showing up on the right of the transcript that includes that word.
No time on your hand? Enhance the speed of the video: click on 1x in the bottom right hand corner and choose a faster speed!