Regular (Monthly) Savings Accounts

Trying to encourage the GF to start saving in a more structured way so can anybody recommend an account in which she could monthly save 10,000 THB for the long(ish) term (say 5+ years)?

I was thinking about an Equity/Mutual fund type account but after trying to do some research on the various banks sites, it's difficult to see what sort of return they've been producing or the charges involved.

Basically just want a long term, low(ish) risk "Savings" account that is likely to deliver more return than just keeping it in a cash savings account. 

Thanks

MTV