for iOS 5.0 software

Vietnamese
Touch and hold a character to see the available diacritical marks, then slide to choose the one
you want.
You can also type the following key sequences to enter characters with diacritical marks:
aa— Â â (a circumex)
aw— Â ă (a caron)
as— Â á (a acute)
af— Â à (a grave)
ar— Â ả (a question mark)
ax— Â ã (a rising accent)
aj— Â ạ (a drop tone)
dd— Â đ (d dash)
ee— Â ê (e circumex)
oo— Â ô (o circumex)
ow— Â ơ (o hook)
w— Â ư (u hook)
156
Appendix A International Keyboards