This is the tuning
D2-A2-E3-G3-D4-A4 (for a children's 53 cm scale length guitar)
It is a 3-courses tambouras D2-A2-E3 and an interval of minor of 3 higher a 3-curses tambouras or sazi G3-D4-A4.
Because the intermediate 4 strings A2-E3-G3-D4 have an minor interval of 3 they it allows for two rows of ordinary major and minor chord triads that use up to 3 frets.
Notice that the notes of the over all tuning D-E-G-A are notes that belong to 5-tonic scales
If the intermediate interval is that of major 3 it is the tuning
Db2-Ab2-Eb3-G3-D4-A4
For the oud and for a standard 66 cm scale length guitar one tone lower is more appropriate
C2-G2-D3-F3-C4-G4
The above tuning seems to be one with the absolute maximum number of strings an interval of 5 apart which also allows for easy up to 3 frets major-minor triads
Notice that the open intervals of 5 (power chords) that can accompany solos are the D-A (D minor or major chord) G-D (G major or minor chord) and A-E (A major or minor chord) and G-D-A are already in distances by interval of 5 that as as if I-IV-V chords of D major or D minor diatonic scales
An alternative that the two tambouras are an interval of 4 LOWER re-entrance E.g.
F2-C3-G3-D3-A3-E4
5-5-(4)-5-5
