A quick wikipedia told me that its basically like a 12 string guitar, with the different sets of strings going up in fourths starting on G#. Each pair of strings should be tuned to the same note.
G♯, c♯, f♯, b, e and a
Which is similar to a regular guitar which also goes up in fourths, except that from the 4th and 5th string (thickest to thinnest) it goes up a major 3rd.
E, A, D, G, B and e
Which means that everything you can play on guitar, can be played on the Bandurria if you transpose everything up 4 semi tones/frets and move what you would play on the guitar on the thinnest two strings, one semi tone/fret back. Which basically means that you need to relearn all your chord grips, but if you are willing to put some work in this, it should be doable.
For some quick fun, you can play power chords all over the neck on the Bandurria.
Alternatively, as far as I know you could simply tune the last two strings on the Bandurria back one semi tone, which will make it very similar to a guitar. This allows you to use everything you can play on guitar, it's just 4 semitones higher. This is not the official tuning though.
This would be:
G♯, c♯, f♯, b, d♯ and g♯
I hope your theoretical knowledge is sufficient to get what I mean, otherwise I could draw it out or something, let me know if this helps.