Hi Dunn,
Thank you for asking this.
Basically, the advanced search the PDF was referring to is the search feature you consider as "regular search." We just call it 'advanced' because the search feature allows users to search for content within the lesson transcripts. So if a lesson teacher said "let's review the accusative form" in some lesson, you can search for 'accusative' and find that lesson, and other related materials that might contain 'accusative.'
Perhaps it wasn't very clear in the PDF
. But I'm glad you asked so it's clear now
Kind regards,
Stefania
Team GreekPod101.com