I'd look around for some sort of workbook or curriculum for phonics in those languages (or work on the sounds and letters as best you can).
I have been told that some VSLs never really learn phonics (for English), they just learn to read by sight words. My DS5, a VSL has a lot of trouble with phonics and he also has a speech delay. He gets special help with this as part of his IEP. Interestingly, I think he is actually developing his own "system" for learning phonics, a little bit at a time. The other day he asked me to spell "book" and "books" and I think he's figuring out about the s at the end. Prior to this, he'd see a word he knew in singular but didn't know it in plural. Now it seems he's starting to get it. It's a slow road.
My DD7 never really understood phonics until more than halfway through first grade. I think it had something to do with auditory memory - she just couldn't blend the sounds. I used to get so frustrated trying to teach her, and when we had her tested at the Gifted Development Center, they explained that as a VSL she simply could not do it.
This is a little off topic but here are a couple articles about spelling and VSLs
http://www.visualspatial.org/Articles/app2spell.pdfhttp://www.visualspatial.org/Articles/spelling.htm
