Thank you for reaching out here in the Community!
Most often the reason why some content might not be available is for legal reasons.
Availability can vary over time and between countries, depending on the permissions from rights holders.
New content is added to Spotify every day, so if you can’t find those songs right now, they may reappear soon.
If you have those songs in a supported format, you can add them as your Local Files.
For more details on availability, make sure to check out this support article.
If it comes to unavailable content, you can choose whether you want it to display or not:
Mobile and tablet
- Tap Home ,
- Tap Settings ,
- Switch Show unplayable songs off (gray) or on (green).
- Click the arrow in the top-right corner next to your display name and select Settings,
- Under Display Options switch Show unavailable songs in playlists off (gray) or on (green).
I hope you'll find this useful!
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Note: I'm not a Spotify employee.