PlaylistItems doesn't showing all VideoNames

I use youtube reporting API to get VideoIDs and some metrics. Then I also use Youtube Data API to get list of ALL VideoNames. But when I combine these two groups, I found out that a lot of names are missing.

HTTP request: GET https://www.googleapis.com/youtube/v3/playlistItems

What is the best HTTP request to get ALL existing VideoNames historically?Why playlistItems doesn't work properly and not showing all VideoNames?Thank you

This is piece of my code:

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