Can I also search for a specific article that is (for daily newspapers) from the previous day or (for weekly newspapers) older than a week?

Yes, you can access articles from daily newspapers up to 60 days (issues) and from weekly newspapers in most cases up to 8 weeks (issues) after they have been released (see: How long are articles stored in the database?).

The period during which the articles are available on the portal can be individually determined by the supplier for each media, so there may be deviations for some media. After this period, the articles in PMG MediaMonitor will no longer be available.